U124C CD CHANGER
Description
Refer to See: Accessories and Optional Equipment\Entertainment Systems\Description and Operation\Multi AV System (Coupe)\System Description.
DTC Logic
DTC DETECTION LOGIC
Diagnosis Procedure
1.CHECK CD CHANGER POWER SUPPLY AND GROUND CIRCUIT
Check CD changer power supply and ground circuit. Refer to See: Accessories and Optional Equipment\Radio, Stereo, and Compact Disc\Testing and Inspection\Component Tests and General Diagnostics\Power Supply And Ground Circuit (Coupe)\CD Changer.
Do power and ground check OK?
YES >> GO TO 2
NO >> Repair power supply or ground circuit.
2.CHECK COMMUNICATION CIRCUIT CONTINUITY
- Turn ignition switch OFF.
- Disconnect CD changer connector M42 and AV control unit connector M48.
- Check continuity between CD changer harness connector M42 (A) terminals 8, 9 and 10 and AV control unit harness connector
M48 (B) terminals 69, 70 and 72.
- Check continuity between CD changer harness connector M42 (A) terminals 8, 9, 10 and ground.
8, 9, 10 - Ground : Continuity should not exist.
Are the continuity test results as specified?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK REQUEST SIGNAL
- Connect CD changer connector and AV control unit connector.
- Turn ignition switch ON.
- Check signal between CD changer harness connector M42 terminal 8 and ground.
8 - Ground
Are the voltage readings as specified?
YES >> GO TO 4
NO >> Replace CD changer. Refer to See: Accessories and Optional Equipment\Radio, Stereo, and Compact Disc\Service and Repair\CD Changer.
4.CHECK COMMUNICATION SIGNAL
Check signal between CD changer harness connector M42 terminal
9 and ground.
9 - Ground
Are the voltage readings as specified?
YES >> GO TO 5
NO >> Replace CD changer. Refer to See: Accessories and Optional Equipment\Radio, Stereo, and Compact Disc\Service and Repair\CD Changer.
5.CHECK COMMUNICATION SIGNAL
Check signal between CD changer harness connector M42 terminal
10 and ground.
10 - Ground
Are the voltage readings as specified?
YES >> Inspection End.
NO >> Replace AV control unit. Refer to See: Accessories and Optional Equipment\Radio/Stereo\Service and Repair\Audio Unit\Bose Audio With Navigation.
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