Rear Door Speaker Circuit Check

Rear Door Speaker Circuit Check

Description

The audio unit sends audio signals to the rear door speakers using the audio signal circuits.

Diagnosis Procedure (Crew Cab)

Regarding Wiring Diagram information, refer to [Mid Audio System: Wiring Diagram [Crew Cab] Mid Audio System [Crew Cab] ].

1. CONNECTOR CHECK

Check the audio unit and speaker connectors for the following:
- Proper connection
- Damage
- Disconnected or loose terminals

Is the inspection result normal?
YES
GO TO 2.
NO
Repair the terminal and connector.

2. SPEAKER HARNESS CHECK

1 Disconnect audio unit connector M87 and the suspect speaker connector.





2 Check continuity between audio unit harness connector M87 (A) and suspect speaker harness connector (B).






3 Check continuity between audio unit harness connector M87 (A) and ground.






Are the continuity test results as specified?
YES
GO TO 3
NO
- Check connector housings for disconnected or loose terminals.
- Repair or replace harness or connector.

3. SPEAKER SIGNAL CHECK

1 Connect audio unit connector M87 and suspect speaker connector.





2 Turn ignition switch to ACC.
3 Push audio unit "POWER" switch.
4 Check the signal between audio unit harness connector M87 terminals with SDT or oscilloscope.






Is the audio signal voltage reading as specified?
YES
Replace suspect speaker. Refer to [Rear Door Speaker: Removal and Installation] Rear Door Speaker.
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.

Diagnosis Procedure (King Cab)

Regarding Wiring Diagram information, refer to [Premium Audio System: Wiring Diagram [King Cab] Premium Audio System [King Cab] ].

1. CONNECTOR CHECK

Check the audio unit and speaker connectors for the following:
- Proper connection
- Damage
- Disconnected or loose terminals

Is the inspection result normal?
YES
GO TO 2.
NO
Repair the terminal and connector.

2. SPEAKER HARNESS CHECK

1 Disconnect audio unit connector M44 and the suspect speaker connector.





2 Check continuity between audio unit harness connector M44 (A) and suspect speaker harness connector (B).






3 Check continuity between audio unit harness connector M44 (A) and ground.






Are the continuity test results as specified?
YES
GO TO 3
NO
- Check connector housings for disconnected or loose terminals.
- Repair or replace harness or connector.

3. SPEAKER SIGNAL CHECK

1 Connect audio unit connector M44 and suspect speaker connector.





2 Turn ignition switch to ACC.
3 Push audio unit "POWER" switch.
4 Check the signal between audio unit harness connector M44 terminals with SDT or oscilloscope.






Is the audio signal voltage reading as specified?
YES
Replace suspect speaker. Refer to [Rear Door Speaker: Removal and Installation] Rear Door Speaker.
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.