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Home >> Mazda >> 2017 >> CX-3 Touring, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> On-Board Diagnostic - Audio >> DTC 16-Er11; 16-Er12; 26-Er81; CAN COMMUNICATION ERROR >> Diagnostic Procedure

Diagnostic Procedure

DTC: 16:ER11, 16:ER12, 26:ER81 [AUDIO] - DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT FOR POWER SUPPLY-RELATED MALFUNCTION Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [SKYACTIV-G 2.0] .)
No Go to the next step.
2 INSPECT CAN_H SIDE CIRCUIT OF LOCAL-CAN FOR SHORT TO POWER SUPPLY
  • Measure the voltage between audio unit terminal 1O and body ground.
  • Is the voltage B+?
 Yes A short to power supply in CAN_H side of LOCAL-CAN has occurred.
  • Go to Step 5.
No Go to the next step.
3 INSPECT CAN_L SIDE CIRCUIT OF LOCAL-CAN FOR SHORT TO GROUND
  • Measure the voltage between audio unit terminal 1Q (LOCAL-CAN CAN_L side) and body ground.
  • Is the voltage 0 V?
 Yes A short to ground in CAN_L side of LOCAL-CAN has occurred.
  • Go to Step 6.
No Go to the next step.
4 INSPECT BETWEEN LOCAL-CAN_L AND LOCAL-CAN_H SIDE CIRCUITS FOR SHORT BETWEEN CIRCUITS
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Measure the resistance between audio unit 1O and 1Q terminals (wiring harness-side).
  • Is the resistance approx. 60 ohms?
 Yes Go to Step 9. (LOCAL-CAN is normal)
No If the resistance is 0 ohm:
  • A short between circuits has occurred in LOCAL-CAN.
    • Go to Step 7.

If the resistance is 120 ohms:
  • An open circuit in the LOCAL-CAN has occurred.
    • Go to Step 8.
5 INSPECT RELATED WIRING HARNESS (SHORT TO POWER SUPPLY) Yes Go to Step 9.
No Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1O and CD player terminal G

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 10.
6 INSPECT RELATED WIRING HARNESS (SHORT TO GROUND)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Audio unit terminal 1Q
    • CD player terminal H
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1Q and CD player terminal H

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to Step 10.
No Go to Step 9.
7 INSPECT RELATED WIRING HARNESS (LINE-TO-LINE SHORT CIRCUIT)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
  • Inspect between the following terminals (wiring harness-side) for continuity.
    • Audio unit terminal 1O and 1Q
    • CD player terminal G and H
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1O and CD player terminal G
  • Audio unit terminal 1Q and CD player terminal H

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short between circuits.
  • Repair or replace the malfunctioning part. If there is no common connector:
  • Repair or replace the wiring harness which has shorted between circuits.

Go to Step 10.
No Go to Step 9.
8 INSPECT RELATED WIRING HARNESS (OPEN CIRCUIT)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
  • Inspect between the following terminals (wiring harness-side) for continuity.
    • Audio unit terminal 1O and CD player terminal G
    • Audio unit terminal 1Q and CD player terminal H
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1O and CD player terminal G
  • Audio unit terminal 1Q and CD player terminal H

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 10.
No Go to the next step.
9 VERIFY IF MALFUNCTIONING LOCATION IS CD PLAYER DEPENDING ON REPEATABILITY Yes Replace the CD player, then go to the next step.
(See CD PLAYER REMOVAL .)
(See CD PLAYER INSTALLATION .)
No Go to the next step.
10 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
11 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [AUDIO] .)
No DTC troubleshooting completed.


DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT FOR POWER SUPPLY-RELATED MALFUNCTION Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [SKYACTIV-G 2.0] .)
No Go to the next step.
2 INSPECT CAN_H SIDE CIRCUIT OF LOCAL-CAN FOR SHORT TO POWER SUPPLY
  • Measure the voltage between audio unit terminal 1O and body ground.
  • Is the voltage B+?
 Yes A short to power supply in CAN_H side of LOCAL-CAN has occurred.
  • Go to Step 5.
No Go to the next step.
3 INSPECT CAN_L SIDE CIRCUIT OF LOCAL-CAN FOR SHORT TO GROUND
  • Measure the voltage between audio unit terminal 1Q (LOCAL-CAN CAN_L side) and body ground.
  • Is the voltage 0 V?
 Yes A short to ground in CAN_L side of LOCAL-CAN has occurred.
  • Go to Step 6.
No Go to the next step.
4 INSPECT BETWEEN LOCAL-CAN_L AND LOCAL-CAN_H SIDE CIRCUITS FOR SHORT BETWEEN CIRCUITS
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Measure the resistance between audio unit 1O and 1Q terminals (wiring harness-side).
  • Is the resistance approx. 60 ohms?
 Yes Go to Step 9. (LOCAL-CAN is normal)
No If the resistance is 0 ohm:
  • A short between circuits has occurred in LOCAL-CAN.
    • Go to Step 7.

If the resistance is 120 ohms:
  • An open circuit in the LOCAL-CAN has occurred.
    • Go to Step 8.
5 INSPECT RELATED WIRING HARNESS (SHORT TO POWER SUPPLY)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
    • Bluetooth® unit
  • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side).
    • Audio unit terminal 1O
    • CD player terminal G
    • Bluetooth® unit terminal Y
  • Is the voltage 0 V?
 Yes Go to Step 9.
No Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1O and CD player terminal G
  • Audio unit terminal 1O and Bluetooth® unit terminal Y

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 11.
6 INSPECT RELATED WIRING HARNESS (SHORT TO GROUND)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
    • Bluetooth® unit
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Audio unit terminal 1Q
    • CD player terminal H
    • Bluetooth® unit terminal Z
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1Q and CD player terminal H
  • Audio unit terminal 1Q and Bluetooth® unit terminal Z

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part. If there is no common connector:
  • Repair or replace the wiring harness which has a short to ground.

Go to Step 11.
No Go to Step 9.
7 INSPECT RELATED WIRING HARNESS (LINE-TO-LINE SHORT CIRCUIT)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
    • Bluetooth® unit
  • Inspect between the following terminals (wiring harness-side) for continuity.
    • Audio unit terminal 1O and 1Q
    • CD player terminal G and H
    • Bluetooth® unit terminal Y and Z
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Audio unit terminal 1O and CD player terminal G
  • Audio unit terminal 1Q and CD player terminal H
  • Audio unit terminal 1O and Bluetooth® unit terminal Y
  • Audio unit terminal 1Q and Bluetooth® unit terminal Z

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short between circuits.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has shorted between circuits.

Go to Step 11.
No Go to Step 9.
8 INSPECT RELATED WIRING HARNESS (OPEN CIRCUIT)
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  • Disconnect the following connectors:
    • Audio unit
    • CD player
    • Bluetooth® unit
    • Connector C-37
  • Inspect between the following terminals (wiring harness-side) for continuity.
    • CD player terminal G and connector C-37
    • CD player terminal H and connector C-37
    • Bluetooth® unit terminal Y and connector C-37
    • Bluetooth® unit terminal Z and connector C-37
    • Audio unit terminal 1O and connector C-37
    • Audio unit terminal 1Q and connector C-37
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • CD player terminal G and connector C-37
  • CD player terminal H and connector C-37
  • Bluetooth® unit terminal Y and connector C-37
  • Bluetooth® unit terminal Z and connector C-37
  • Audio unit terminal 1O and connector C-37
  • Audio unit terminal 1Q and connector C-37

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 11.
No Go to Step 9.
9 VERIFY IF MALFUNCTIONING LOCATION IS Bluetooth® UNIT DEPENDING ON REPEATABILITY
NOTE:
  • For vehicles without the Bluetooth® unit, go to the next step.
 Yes Replace the Bluetooth® unit, then go to the next step.
(See Bluetooth® UNIT REMOVAL/INSTALLATION .)
No Go to the next step.
10 VERIFY IF MALFUNCTIONING LOCATION IS CD PLAYER DEPENDING ON REPEATABILITY Yes Replace the CD player, then go to the next step.
(See CD PLAYER REMOVAL .)
(See CD PLAYER INSTALLATION .)
No Go to the next step.
11 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
12 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [AUDIO] .)
No DTC troubleshooting completed.
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