U0241

U0241-00-LOST COMMUNICATION WITH AUTO HIGHBEAM HEADLAMP CONTROL MODULE (AHBM)





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

- When Monitored:
With the ignition on.

- Set Condition:
The Body Control Module (BCM) does not receive information from the Auto Highbeam Module (AHBM).





1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Wait 30 seconds.
4. With the scan tool, read DTCs.

Does the scan tool display: U0161-00-LOST COMMUNICATION WITH AUTO HIGHBEAM MODULE?

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.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE (F924) FUSED RUN RELAY OUTPUT CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Inside Rearview Mirror harness connector.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (F924) Fused Run Relay Output circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the open or short to ground in the (F924) Fused Run Relay Output circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (Z910) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open in the (Z910) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (D402) BCM LIN 2 BUS CIRCUIT FOR AN OPEN
1. Turn the ignition on.
2. Measure the voltage between ground and the (D402) BCM LIN 2 BUS circuit.

Is the voltage above 5.0 volts?

Yes

- Replace the Auto Highbeam Module. Interior Rearview Mirror - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the open in the (D402) BCM LIN 2 Bus circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.