Auto Highbeam Module (AHBM)

B210D-BATTERY VOLTAGE LOW

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

- When Monitored:
With the ignition on.

- Set Condition:
The Auto High Beam Module (Rearview Mirror) detects the supply circuit voltage below 10.0 volts.





Diagnostic Test

1. CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read the DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

2. FUSED IGNITION SWITCH OUTPUT SUPPLY CIRCUIT OPEN/HIGH RESISTANCE, SHORTED TO GROUND
1. Turn the ignition off.
2. Disconnect the Rearview Mirror harness connector.
3. Turn the ignition on.
4. Measure the voltage of the Fused Ignition Switch Output circuit at the Rearview Mirror harness connector.

Is battery voltage present?

Yes

- Go To 3

No

- Using the wiring diagrams as a guide, repair the Fused Ignition Switch Output circuit for an open, high resistance, or short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. GROUND CIRCUIT OPEN
1. Turn the ignition off.
2. Measure the resistance between ground and the Ground circuit at the Rearview Mirror harness connector.

Is the resistance above 10.0 Ohms?

Yes

- Repair the open in the Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Rearview Mirror.
- Perform the BODY VERIFICATION TEST. Body Verification Test.