Checking the Carphone Handset

Checking the carphone handset

Checking components and wiring
The carphone handset will not function in the event of an open-circuit or short-circuit in the wiring, of a defective handset or faulty connectors. This means that the user will only be able to use the handsfree function.

Checking the connectors and cables
Check the power supply cable between phone module (PHM) connector terminal #11 (#53) and handset connector terminal #5 (#25). Check for an open-circuit.
Check the ground cable between phone module (PHM) connector terminal #B6 (#48) and handset connector terminal #3 (#23). Check for an open-circuit, for a short-circuit to ground and a short-circuit to supply voltage.
Check the connectors for loose connections, damaged or bent terminal pins and oxidation.
Try replacing the carphone handset if no fault is found.

Other information:
- To access the phone module (PHM), see Phone module (PHM), replacing Phone Module (PHM), Replacing
- To access or replace the handset, see Handset, replacing Handset, Replacing
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- For information about signals and connectors, see Signal specification Signal Specification, Phone Module (PHM)
- Checking wiring and terminals Checking Wiring and Terminals.













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