B1459

B1459-TELEMATICS MIRROR CONTROL CIRCUIT LOW





For complete wiring diagrams refer to Diagrams/Electrical.


- When Monitored:

With the ignition on.

- Set Condition:

The Hands Free Module detects low voltage on the (X793) Microphone Feed circuit.







Diagnostic Test


1. CHECK FOR ACTIVE DTC

With 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 Rearview Mirror C2 harness connector.

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 BODY VERIFICATION TEST - VER 1. Body Verification Test



3. (X793) MICROPHONE FEED CIRCUIT SHORT TO GROUND





Measure the resistance between ground and the (X793) Microphone Feed circuit

Is the resistance below 100.0 ohms?

Yes

- Repair the (X793) Microphone Feed circuit for short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 4



4. INSIDE REARVIEW MIRROR

Replace the Inside Rearview Mirror.

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.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair is complete.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test