B2127

B2127-SENSOR SUPPLY VOLTAGE HIGH





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

- When Monitored:
With the Headlamps on.

- Set Condition:
The Auto Headlamp Leveling Module (AHLM) detects a HIGH condition on the output circuit.





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

Does the scan tool display: B2127-SENSOR SUPPLY VOLTAGE HIGH?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO BATTERY
1. Turn the ignition off.
2. Disconnect the Headlamp Leveling Module harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit.

Is the voltage above 10.0 volts?

Yes

- Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for a short to battery.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT OPEN
1. Turn the ignition off.
2. Measure the resistance of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Headlamp Leveling Module (HIDT).
- Perform the BODY VERIFICATION TEST. Body Verification Test.