Determination Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.
Disconnect the negative battery cable before performing any work that requires handling of connectors.

NOTE:

If the ignition does not turn on even if the ignition is switched ON, switch the ignition ON referring to the forced ignition ON procedure. (See FORCED IGNITION ON .)

Step	Inspection		Action
1	INSPECT BETWEEN FRONT BODY CONTROL MODULE (FBCM) AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect connector 2 which has front body control module (FBCM) terminals 2R and 2L. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals F and E. Is the voltage at DLC-2 terminals F and E the same?	Yes	Go to Step 17.
1		No	Go to the next step.
2	INSPECT FRONT BODY CONTROL MODULE (FBCM) FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Inspect for continuity between front body control module (FBCM) terminals 2R and 2L. Is there continuity?	Yes	Replace the front body control module (FBCM) because there is a short between circuits in the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION .)
2		No	Go to the next step.
3	INSPECT BETWEEN CONNECTOR C-01 AND FRONT BODY CONTROL MODULE (FBCM) FOR SHORT BETWEEN CIRCUITS Disconnect connector C-01. Connect connector 2 which has front body control module (FBCM) terminals 2R and 2L. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals F and E. Is the voltage at DLC-2 terminals F and E the same?	Yes	Repair or replace the wiring harness between connector C-01 and front body control module (FBCM) because the wiring harness is shorted between circuits.
3		No	Go to the next step.
4	INSPECT BETWEEN TCM AND CONNECTOR C-01 FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Inspect for continuity between TCM terminals E and F. Is there continuity?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT TCM FOR SHORT BETWEEN CIRCUITS Disconnect the TCM connector. Inspect for continuity between TCM terminals E and F (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the TCM and connector C-01 because the wiring harness is shorted between circuits.
5		No	Replace the TCM because there is a short between circuits in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL] .)
6	INSPECT BETWEEN CONNECTOR C-01 AND CONNECTOR C-32 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-32. Connect connector C-01. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals F and E. Is the voltage at DLC-2 terminals F and E the same?	Yes	Repair or replace the wiring harness between connector C-01 and connector C-32 because the wiring harness is shorted between circuits.
6		No	Go to the next step.
7	INSPECT BETWEEN ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE/AUTO LEVELING CONTROL MODULE AND CONNECTOR C-32 FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Inspect for continuity between adaptive front lighting system (AFS) control module/auto leveling control module terminals A and B. Is there continuity?	Yes	Go to the next step.
7		No	Go to Step 9.
8	INSPECT ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE/AUTO LEVELING CONTROL MODULE FOR SHORT BETWEEN CIRCUITS Disconnect the adaptive front lighting system (AFS) control module/auto leveling control module connector. Inspect for continuity between adaptive front lighting system (AFS) control module/auto leveling control module terminals A and B (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the adaptive front lighting system (AFS) control module/auto leveling control module and connector C-32 because the wiring harness is shorted between circuits.
8		No	Replace the adaptive front lighting system (AFS) control module/auto leveling control module because there is a short between circuits in the adaptive front lighting system (AFS) control module/auto leveling control module. (See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION .) (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION .)
9	INSPECT BETWEEN DC-DC CONVERTER (i-ELOOP) AND CONNECTOR C-32 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between DC-DC converter (i-ELOOP) terminals 1A and 1C. Is there continuity?	Yes	Go to the next step.
9		No	Go to Step 12.
10	INSPECT BETWEEN DC-DC CONVERTER (i-ELOOP) AND CONNECTOR C-05 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-05. Inspect for continuity between DC-DC converter (i-ELOOP) terminals 1A and 1C. Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness between connector C-32 and connector C-05 because the wiring harness is shorted between circuits.
11	INSPECT DC-DC CONVERTER (i-ELOOP) FOR SHORT BETWEEN CIRCUITS Disconnect the DC-DC converter (i-ELOOP) connector. Inspect for continuity between DC-DC converter (i-ELOOP) terminals 1A and 1C (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the DC-DC converter (i-ELOOP) and connector C-05 because the wiring harness is shorted between circuits.
11		No	Replace the DC-DC converter (i-ELOOP) because there is a short between circuits in the DC-DC converter (i-ELOOP). (See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP] .)
12	INSPECT BETWEEN CONNECTOR C-60 AND CONNECTOR C-32 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-60. Connect connector C-32. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals F and E. Is the voltage at DLC-2 terminals F and E the same?	Yes	Repair or replace the wiring harness between connector C-60 and connector C-32 because the wiring harness is shorted between circuits.
12		No	Go to the next step.
13	INSPECT BETWEEN DSC HU/CM AND CONNECTOR C-60 FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Inspect for continuity between DSC HU/CM terminals AF and AC. Is there continuity?	Yes	Go to the next step.
13		No	Go to Step 15.
14	INSPECT DSC HU/CM FOR SHORT BETWEEN CIRCUITS Disconnect the DSC HU/CM connector. Inspect for continuity between DSC HU/CM terminals AF and AC (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the DSC HU/CM and connector C-60 because the wiring harness is shorted between circuits.
14		No	Replace the DSC HU/CM because there is a short between circuits in the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION .)
15	INSPECT BETWEEN RADAR UNIT AND CONNECTOR C-60 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between radar unit terminals D and C. Is there continuity?	Yes	Go to the next step.
15		No	Go to Step 43.
16	INSPECT RADAR UNIT FOR SHORT BETWEEN CIRCUITS Disconnect the radar unit connector. Inspect for continuity between radar unit terminals D and C (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the radar unit and connector C-60 because the wiring harness is shorted between circuits.
16		No	Replace the radar unit because there is a short between circuits in the radar unit. (See RADAR UNIT REMOVAL/INSTALLATION .)
17	INSPECT BETWEEN CONNECTOR C-03 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect connector C-03. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals F and E. Is the voltage at DLC-2 terminals F and E the same?	Yes	Go to the next step.
17		No	Repair or replace the wiring harness between front body control module (FBCM) and connector C-03 because the wiring harness is shorted between circuits.
18	INSPECT BETWEEN CONNECTOR C-12 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect connector C-12. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals F and E. Is the voltage at DLC-2 terminals F and E the same?	Yes	Go to Step 21.
18		No	Go to the next step.
19	INSPECT BETWEEN FORWARD SENSING CAMERA (FSC) AND CONNECTOR C-12 FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Inspect for continuity between forward sensing camera (FSC) terminals M and N. Is there continuity?	Yes	Go to the next step.
19		No	Repair or replace the wiring harness between connector C-03 and connector C-12 because the wiring harness is shorted between circuits.
20	INSPECT FORWARD SENSING CAMERA (FSC) FOR SHORT BETWEEN CIRCUITS Disconnect the forward sensing camera (FSC) connector. Inspect for continuity between forward sensing camera (FSC) terminals M and N (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the forward sensing camera (FSC) and connector C-12 because the wiring harness is shorted between circuits.
20		No	Replace the forward sensing camera (FSC) because there is a short between circuits in the forward sensing camera (FSC). (See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION .)
21	INSPECT BETWEEN CONNECTOR C-12 AND CONNECTOR C-33 FOR SHORT BETWEEN CIRCUITS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect connector C-33. Connect connector C-12. Connect connector C-03. Inspect for continuity between forward front body control module (FBCM) terminals 2P and 2N (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-12 and connector C-33 because the wiring harness is shorted between circuits.
21		No	Go to the next step.
22	INSPECT BETWEEN CONNECTOR C-33 AND DLC-2 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between DLC-2 terminals F and E. Is there continuity?	Yes	Repair or replace the wiring harness between connector C-33 and DLC-2 because the wiring harness is shorted between circuits.
22		No	Go to the next step.
23	INSPECT BETWEEN EPS CONTROL MODULE AND CONNECTOR C-33 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between EPS control module terminals 2B and 2D. Is there continuity?	Yes	Go to the next step.
23		No	Go to Step 25.
24	INSPECT EPS CONTROL MODULE FOR SHORT BETWEEN CIRCUITS Disconnect the EPS control module connector. Inspect for continuity between EPS control module terminals 2B and 2D (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the EPS control module and connector C-33 because the wiring harness is shorted between circuits.
24		No	Replace the EPS control module because there is a short between circuits in the EPS control module. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
25	INSPECT BETWEEN START STOP UNIT AND CONNECTOR C-33 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between start stop unit terminals 2M and 2O. Is there continuity?	Yes	Go to the next step.
25		No	Go to Step 27.
26	INSPECT START STOP UNIT FOR SHORT BETWEEN CIRCUITS Disconnect the start stop unit connector. Inspect for continuity between start stop unit terminals 2M and 2O (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the start stop unit and connector C-33 because the wiring harness is shorted between circuits.
26		No	Replace the start stop unit because there is a short between circuits in the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION .)
27	INSPECT JB No. 2 FOR SHORT BETWEEN CIRCUITS Connect connector C-33. Disconnect connector C-34. Inspect for continuity between forward DLC-2 terminals F and E. Is there continuity?	Yes	Replace the JB No. 2 because there is a short between circuits in the JB No. 2.
27		No	Go to the next step.
28	INSPECT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND CONNECTOR C-34 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between connectivity master unit (CMU) terminals 2E and 2F. Is there continuity?	Yes	Go to the next step.
28		No	Go to Step 30.
29	INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT BETWEEN CIRCUITS Disconnect the connectivity master unit (CMU). Inspect for continuity between connectivity master unit (CMU) terminals 2E and 2F (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between connectivity master unit (CMU) and connector C-34 because the wiring harness is shorted between circuits.
29		No	Replace the connectivity master unit (CMU) because there is a short between circuits in the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION .)
30	INSPECT BETWEEN SAS CONTORL MODULE AND CONNECTOR C-34 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between SAS control module terminals 3B and 3C. Is there continuity?	Yes	Go to the next step.
30		No	Go to Step 32.
31	INSPECT SAS CONTORL MODULE FOR SHORT BETWEEN CIRCUITS Disconnect the SAS control module. Inspect for continuity between SAS control module terminals 3B and 3C (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between SAS control module and connector C-34 because the wiring harness is shorted between circuits.
31		No	Replace the SAS control module because there is a short between circuits in the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM] .)
32	INSPECT BETWEEN CONNECTOR C-34 AND CONNECTOR C-09 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-09. Connect connector C-34. Inspect for continuity between DLC-2 terminals F and E. Is there continuity?	Yes	Repair or replace the wiring harness between connector C-34 and connector C-09 because the wiring harness is shorted between circuits.
32		No	Go to the next step.
33	INSPECT BETWEEN AUDIO AMPLIFIER/ELECTRIC PARKING BRAKE CONTROL MODULE/OCCUPANT CLASSIFICATION SENSOR AND CONNECTOR C-09 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between audio amplifier terminals 2L and 2N. (with Bose ® type audio) Inspect for continuity between electric parking brake control module terminals AD and AB. (with electric parking brake (EPB)) Inspect for continuity between occupant classification sensor terminals 3D and 3C (with occupant classification sensor). Is there continuity?	Yes	Go to the next step.
33		No	Go to Step 42.
34	INSPECT BETWEEN CONNECTOR C-09 AND CONNECTOR C-40 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-40. Connect connector C-09. Inspect for continuity between DLC-2 terminals F and E. Is there continuity?	Yes	Repair or replace the wiring harness between connector C-09 and connector C-40 because the wiring harness is shorted between circuits.
34		No	Go to the next step.
35	INSPECT BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-40 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between audio amplifier terminals 2L and 2N. Is there continuity?	Yes	Go to the next step.
35		No	Go to Step 37.
36	INSPECT AUDIO AMPLIFIER FOR SHORT BETWEEN CIRCUITS Disconnect the audio amplifier connector. Inspect for continuity between audio amplifier terminals 2L and 2N (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the audio amplifier and connector C-40 because the wiring harness is shorted between circuits.
36		No	Replace the audio amplifier because there is a short between circuits in the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION .)
37	INSPECT BETWEEN ELECTRIC PARKING BRAKE CONTROL MODULE AND CONNECTOR C-40 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between electric parking brake control module terminals AD and AB. Is there continuity?	Yes	Go to the next step.
37		No	Go to Step 39.
38	INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE FOR SHORT BETWEEN CIRCUITS Disconnect the electric parking brake control module connector. Inspect for continuity between electric parking brake control module terminals AD and AB (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the electric parking brake control module and connector C-40 because the wiring harness is shorted between circuits.
38		No	Replace the electric parking brake control module because there is a short between circuits in the electric parking brake control module. (See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION .)
39	INSPECT BETWEEN OCCUPANT CLASSIFICATION SENSOR AND CONNECTOR C-40 FOR SHORT BETWEEN CIRCUITS Inspect for continuity between occupant classification sensor terminals 3D and 3C. Is there continuity?	Yes	Go to the next step.
39		No	Repair or replace the wiring harness between connector C-40 and connector C-09 because the wiring harness is shorted between circuits.
40	INSPECT BETWEEN CONNECTOR C-40 AND CONNECTOR C-26 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-26. Inspect for continuity between occupant classification sensor terminals 3D and 3C. Is there continuity?	Yes	Go to the next step.
40		No	Repair or replace the wiring harness between connector C-40 and connector C-26 because the wiring harness is shorted between circuits.
41	INSPECT OCCUPANT CLASSIFICATION SENSOR FOR SHORT BETWEEN CIRCUITS Disconnect the occupant classification sensor connector. Inspect for continuity between occupant classification sensor terminals 3D and 3C (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the occupant classification sensor and connector C-26 because the wiring harness is shorted between circuits.
41		No	Replace the occupant classification sensor because there is a short between circuits in the occupant classification sensor. (See OCCUPANT CLASSIFICATION SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
42	INSPECT INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS Disconnect the instrument cluster connector. Inspect for continuity between instrument cluster terminals B and D (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-09 because the wiring harness is shorted between circuits.
42		No	Replace the instrument cluster because there is a short between circuits in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
43	INSPECT PCM FOR SHORT BETWEEN CIRCUITS Disconnect the PCM connector. Inspect for continuity between PCM terminals 2AK and 2AL (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the PCM and connector C-60 because the wiring harness is shorted between circuits.
43		No	Replace the PCM because there is a short between circuits in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)