Rear Door Speaker Circuit Check

Rear Door Speaker Circuit Check

Description

The audio unit sends audio signals to the audio amplifier The audio amplifier amplifies the audio signals before sending them to the rear door speakers using the audio signal circuits.

Diagnosis Procedure

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

1. SPEAKER HARNESS CHECK

1 Disconnect audio amplifier connectors B159 and suspect speaker connector.





2 Check continuity between audio amplifier harness connectors B159 (A) and suspect speaker harness connector (B).






3 Check continuity between audio amplifier harness connectors B159 (A) and ground.






Are the continuity test results as specified?
YES
GO TO 2
NO
- Check connector housings for disconnected or loose terminals.
- Repair or replace harness or connector.

2. SPEAKER SIGNAL CHECK

1 Connect audio amplifier connectors and suspect speaker connector.





2 Turn ignition switch to ACC.
3 Push audio unit "POWER" switch.
4 Check the signal between audio amplifier harness connectors B159 terminals with SDT or oscilloscope.






Are audio signal voltage readings as specified?
YES
Replace suspect speaker. Refer to [Rear Door Speaker: Removal and Installation].
NO
GO TO 3

3. PRE-AUDIO AMPLIFIER HARNESS CHECK

1 Disconnect audio unit connector M66 and audio amplifier connector B159.





2 Check continuity between audio unit harness connector M66 (A) and audio amplifier harness connector B159 (B).






3 Check continuity between audio unit harness connector M66 (A) and ground.






Are the continuity test results as specified?
YES
GO TO 4
NO
- Check connector housings for disconnected or loose terminals.
- Repair or replace harness or connector.

4. PRE-AUDIO AMPLIFIER SIGNAL CHECK

1 Connect audio unit connector M66 and audio amplifier connector B159.





2 Turn ignition switch to ACC.
3 Push audio unit "POWER" switch.
4 Check the signal between audio unit harness connector M66 terminals with SDT or oscilloscope.






Is the audio signal voltage reading as specified?
YES
Replace audio amplifier Refer to [Audio AMP: Removal and Installation].
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation].