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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> On-Board Diagnostic - Audio >> DTC: 16-Er12; 26-Er81; CAN SYSTEM COMMUNICATION ERRORS >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT FOR SHORT TO POWER SUPPLY IN CAN_H SIDE CIRCUIT OF PRIVATE-CAN
  • Measure the voltage between audio unit terminal 1O (PRIVATE-CAN CAN_H side) and body ground.
  • Is the voltage B+?
    NOTE:
    • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured.
 Yes A short to power supply in CAN_H side of PRIVATE-CAN has occurred.
Go to Step 5.
No Go to the next step.
2 INSPECT FOR SHORT TO GROUND IN CAN_L SIDE CIRCUIT OF PRIVATE-CAN
  • Measure the voltage between audio unit terminal 1Q and body ground.
  • Is the voltage 0 V?
 Yes A short to ground in CAN_L side of PRIVATE-CAN has occurred.
Go to Step 7.
No Go to the next step.
3 INSPECT BETWEEN PRIVATE-CAN_H AND CAN_L SIDES FOR SHORT BETWEEN CIRCUITS
  • Inspect for continuity at the following terminals:
    • Audio unit terminal 1O
      • Audio unit terminal 1Q
  • Is there continuity?
 Yes A short between circuits has occurred in PRIVATE-CAN.
Go to Step 9.
No Go to the next step.
4 DETERMINE OPEN CIRCUIT LOCATION
  • Clear the audio unit DTCs. (See CLEARING DTC [AUDIO UNIT] .)
  • Switch the ignition ON (engine off or on) and wait for 12 s or more.
  • Perform the audio unit DTC inspection. (See DTC INSPECTION [AUDIO UNIT] .)
  • Are any DTCs of the following displayed?
    • 16:Er12
      • 26:Er81
 Yes 16:Er12 is displayed
  • Go to Step 11.

26:Er81 is displayed
  • Go to Step 12.
No Go to Step 15.
5 INSPECT WIRING HARNESS FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness which is shorted to power supply, then go to Step 14.
6 VERIFY IF MALFUNCTIONING LOCATION IS Bluetooth ® UNIT DEPENDING ON REPEATABILITY Yes Replace the Bluetooth ® unit, then go to Step 14.
(See Bluetooth® UNIT REMOVAL/INSTALLATION .)
No Go to Step 15.
7 INSPECT WIRING HARNESS FOR SHORT TO GROUND
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • Bluetooth ® unit
      • Connector C-58
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground.
    • Audio unit terminal 1Q
      • Bluetooth ® unit terminal Z
  • Is there continuity?
 Yes Repair or replace the wiring harness which is shorted to ground, then go to Step 14.
No Go to the next step.
8 VERIFY IF MALFUNCTIONING LOCATION IS Bluetooth ® UNIT DEPENDING ON REPEATABILITY Yes Replace the Bluetooth ® unit, then go to Step 14.
(See Bluetooth® UNIT REMOVAL/INSTALLATION .)
No Go to Step 15.
9 INSPECT WIRING HARNESS FOR SHORT BETWEEN CIRCUITS
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • Bluetooth ® unit
      • Connector C-58
  • Inspect between the following terminals (wiring harness-side) for continuity.
    • Audio unit terminals 1O and 1Q
      • Bluetooth ® unit terminals Y and Z
  • Is there continuity?
 Yes Repair or replace the wiring harness which is shorted between circuits, then go to Step 14.
No Go to the next step.
10 VERIFY IF MALFUNCTIONING LOCATION IS Bluetooth ® UNIT DEPENDING ON REPEATABILITY Yes Replace the Bluetooth ® unit, then go to Step 14.
(See Bluetooth® UNIT REMOVAL/INSTALLATION .)
No Go to Step 15.
11 INSPECT WIRING HARNESS BETWEEN CONNECTOR C-58 AND AUDIO UNIT FOR OPEN CIRCUIT
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
      • Connector C-58
  • Inspect the wiring harness for continuity between the following terminals (wiring harness-side).
    • Audio unit terminal 1O-Connector C-58
      • Audio unit terminal 1Q-Connector C-58
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness which has an open circuit, then go to Step 14.
12 INSPECT WIRING HARNESS BETWEEN Bluetooth ® UNIT AND CONNECTOR C-58 FOR OPEN CIRCUIT
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Bluetooth ® unit
      • Connector C-58
  • Inspect the wiring harness for continuity between the following terminals (wiring harness-side).
    • Bluetooth ® unit terminal Y-Connector C-58
      • Bluetooth ® unit terminal Z-Connector C-58
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness which has an open circuit, then go to Step 14.
13 VERIFY IF MALFUNCTIONING LOCATION IS Bluetooth ® UNIT DEPENDING ON REPEATABILITY Yes Replace the Bluetooth ® unit, then go to next step.
(See Bluetooth® UNIT REMOVAL/INSTALLATION .)
No Go to Step 15.
14 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
15 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [AUDIO UNIT] .)
No DTC troubleshooting completed.
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