Checking components and wiring
- Ignition off.
Check the cable (microphone signal) between carphone module A3 (terminal #3) and the handset D3 (#34). Check for an open-circuit according to Open-circuit, permanent faults .
Check the cable (speaker signal) between carphone module A12 (12) and handset D4 (terminal #35). Check for an open-circuit according to Open-circuit, permanent faults .
Check the cable (power supply) between carphone module A13 (terminal #13) and handset D7 (terminal #38). Check for an open-circuit according to Open-circuit, permanent faults .
Check the cable (cradle signal) between carphone module A14 (terminal #14) and handset D6 (terminal #37). Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .
Check the cable (ground) between carphone module A2 (terminal #2) and handset D5 (terminal #36). Check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .
Try replacing the handset.
Remedy as necessary.
Other information:
- To access and replace the handset, see Replacing the handset
- To access and replace the carphone module, see Telephone module/-control module (PHM), changing
- For information about signals and connectors, see Signal description. Phone module (PHM)
- To connect the breakout box, see Connecting the breakout box. Carphone module .