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.

Step	Inspection		Action
1	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-34 AND INSTRUMENT CLUSTER Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect connector C-34. Inspect for continuity at the following terminals: Between DLC-2 terminal L and body ground Between DLC-2 terminal K and body ground Is there continuity?	Yes	Go to Step 3.
1		No	Go to the next step.
2	INSPECT CAN LINE IN INSTRUMENT CLUSTER FOR SHORT TO GROUND Disconnect the instrument cluster connector. Inspect for continuity at the following terminals: Between instrument cluster terminal C and body ground Between instrument cluster terminal E and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-34 because the wiring harness is shorted to ground.
2		No	Replace the instrument cluster because there is a short to ground in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
3	INSPECT CAN LINE IN JB No. 2 FOR SHORT TO GROUND Connect connector C-34. Disconnect connector C-33. Inspect for continuity at the following terminals: Between instrument cluster terminal C and body ground Between instrument cluster terminal E and body ground Is there continuity?	Yes	Replace the JB No. 2 because there is a short to ground in the JB No. 2.
3		No	Go to the next step.
4	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-33 AND DLC-2 Inspect for continuity at the following terminals: Between DLC-2 terminal L and body ground Between DLC-2 terminal K and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-33 and DLC-2 because the wiring harness is shorted to ground.
4		No	Go to the next step.
5	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-33 AND CLIMATE CONTROL UNIT Inspect for continuity at the following terminals: Between climate control unit terminal 1S and body ground (with full-auto a/c (dual type)) Between climate control unit terminal 1U and body ground (with full-auto a/c (dual type)) Between climate control unit terminal D and body ground (with full-auto a/c (single type)) Between climate control unit terminal B and body ground (with full-auto a/c (single type)) Is there continuity?	Yes	Go to the next step.
5		No	Go to Step 7.
6	INSPECT CAN LINE IN CLIMATE CONTROL UNIT FOR SHORT TO GROUND Disconnect the climate control unit connector. Inspect for continuity at the following terminals: Between climate control unit terminal 1S (wiring harness side) and body ground (with full-auto a/c (dual type)) Between climate control unit terminal 1U (wiring harness side) and body ground (with full-auto a/c (dual type)) Between climate control unit terminal D (wiring harness side) and body ground (with full-auto a/c (single type)) Between climate control unit terminal B (wiring harness side) and body ground (with full-auto a/c (single type)) Is there continuity?	Yes	Repair or replace the wiring harness between the climate control unit and connector C-33 because the wiring harness is shorted to ground.
6		No	Replace the climate control unit because there is a short to ground inside the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
7	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-59 AND CONNECTOR C-33 Disconnect connector C-59. Connect connector C-33. Inspect for continuity at the following terminals: Between DLC-2 terminal L and body ground Between DLC-2 terminal K and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-59 and connector C-33 because the wiring harness is shorted to ground.
7		No	Go to the next step.
8	INSPECT FOR SHORT TO GROUND BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND REAR BODY CONTROL MODULE (RBCM) Disconnect the rear body control module (RBCM) connector. Inspect for continuity at the following terminals: Between rear body control module (RBCM) terminal 4G (wiring harness side) and body ground Between rear body control module (RBCM) terminal 4J (wiring harness side) and body ground Is there continuity?	Yes	Go to the next step.
8		No	Go to Step 11.
9	INSPECT FOR SHORT TO GROUND BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND CONNECTOR C-19 Disconnect connector C-19. Inspect for continuity at the following terminals: Between blind spot monitoring (BSM) control module (LH) terminal C and body ground Between blind spot monitoring (BSM) control module (LH) terminal D and body ground Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-19 because the wiring harness is shorted to ground.
10	INSPECT CAN LINE IN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) FOR SHORT TO GROUND Disconnect the blind spot monitoring (BSM) control module (LH) connector. Inspect for continuity at the following terminals: Between blind spot monitoring (BSM) control module (LH) terminal C (wiring harness side) and body ground Between blind spot monitoring (BSM) control module (LH) terminal D (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the blind spot monitoring (BSM) control module (LH) and connector C-19 because the wiring harness is shorted to ground.
10		No	Replace the blind spot monitoring (BSM) control module (LH) because there is a short to ground in the blind spot monitoring (BSM) control module (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION .)
11	INSPECT CAN LINE IN REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO GROUND Inspect for continuity at the following terminals: Between rear body control module (RBCM) terminal 3E and body ground Between rear body control module (RBCM) terminal 3G and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-59 because the wiring harness is shorted to ground.
11		No	Replace the rear body control module (RBCM) because there is a short to ground in the rear body control module (RBCM). (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION .)