B145B-TELEMATICS MIRROR CONTROL CIRCUIT OPEN
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The Hands Free Module detects high voltage on the (X793) Microphone Feed circuit.
| Possible Causes |
| (X793) MICROPHONE FEED CIRCUIT OPEN |
| INSIDE REAR VIEW MIRROR |
| HANDS FREE MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCWith the scan tool, read the active DTC's.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
Attempt to make a phone call with the system.
With the scan tool, read the active DTC's.
Does the scan tool display this DTC as active?
Yes
- Go To 2
No
- If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2. (X793) MICROPHONE FEED CIRCUIT OPEN
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Disconnect the Inside Rear View Mirror C2 harness connector.
Measure the resistance of the (X793) Microphone Feed circuit between the HFM connector and the inside rear view mirror connector.
Is the resistance below 5.0 ohms?
Yes
- Go To 3
No
- Repair the (X793) Microphone Feed circuit for an open.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
3. INSIDE REAR VIEW MIRROR
Replace the Inside Rear View Mirror in accordance with the service information.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
Attempt to make a phone call with the system.
With the scan tool, read the active DTC's.
Does the scan tool display this DTC as active?
Yes
- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Repair is complete.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).