Checking Antenna Cable For GSM

Checking antenna cable for GSM

Identifying symptoms

Note! Carry out the following checks in an area known to have good coverage.




- Ignition on.
- A telephone call should be connected
- Half audio volume.
- If audio is cut off and/or disappears (poor reception/coverage), compare with another vehicle under the same conditions.

Is there a difference in sound reproduction/reception between the vehicles?

Yes - Checking the component and wiring

No - No Fault Found

-------------------------------------------------

Checking the component and wiring




- Ignition off.
- Unplug connector C1 for the phone module (PHM).
- Unplug connector C2 for the phone module (PHM).
Check the cable for the carphone antenna. Check for a short-circuit to supply voltage.
Take readings between:
- Connector # C1-5 (#5) and connector C#2-1.
- Connector #C1-5 (#5) and connector C#2-2.
Check the cable for short-circuit to ground.
Take readings between:
- Connector #C1-6 (#6) and connector #C2-1.
- Connector #C1-6 (#6) and connector #C2-2.
Check the cable for the carphone antenna. Check for an open-circuit.
Measure the antenna cable's connector between #1 and #2. Resistance for a functioning antenna shall be approx. 10 kohms.
Check the connectors for loose connections, damaged or bent terminal pins and oxidation.
Try replacing the carphone antenna if the cables are OK.
Remedy as necessary.

Other information:
- For further information about the fuses and relays, see the Wiring Diagram.
- Signal specification Signal Specification, Phone Module (PHM)
- Connecting the breakout box Connecting The Breakout Box, Phone Module (PHM)
- Location of components Locations
- Checking wiring and terminals Checking Wiring And Terminals
- Antenna, Global positioning system module (GPS) Antenna, Global Positioning System Module (GPS)
- Phone Module (PHM) Service and Repair





Continue - Verification

-------------------------------------------------

Verification









Hint: After carrying out the repair, check that the fault has been remedied.

- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
- Activate the carphone.
Make a call so that both the handset and the hands-free system are used. See the instruction manual.

Is the function OK?

Yes - FAULT FOUND

No - Information

-------------------------------------------------

Information




Information

Fault-tracing information
The fault must now be detected and remedied. As this is not the case, troubleshooting has failed.
Exit symptom symptom troubleshooting or try again.

Do you want to exit symptom troubleshooting?

Yes - Exit fault-tracing

No - Attempt New Test

------------------------

Attempt New Test - Identifying symptoms

FAULT-TRACING FAILED - No Fault Found

-------------------------------------------------