B145B

B145B-TELEMATICS MIRROR CONTROL CIRCUIT OPEN





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on.

- Set Condition:
The Hands Free Module detects an open on the (X793) Microphone Feed circuit.





1. CHECK FOR ACTIVE DTC
1. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. Attempt to make a phone call with the system.
4. With the scan tool, read the active DTCs.

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.
- Perform the BODY VERIFICATION TEST. Body Verification Test

2. (X793) MICROPHONE FEED CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Hands Free Module harness connector.
3. Disconnect the Inside Rearview Mirror harness connector.
4. Measure the resistance of the (X793) Microphone Feed circuit between the HFM connector and the inside rearview mirror connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 3

No

- Repair the (X793) Microphone Feed circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test

3. INSIDE REARVIEW MIRROR
1. Replace the Inside Rearview Mirror.
2. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. Attempt to make a phone call with the system.
4. With the scan tool, read the active DTCs.

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.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

- Repair is complete.
- Perform the BODY VERIFICATION TEST. Body Verification Test