B16D4

B16D4-RIGHT DRL LAMP CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to the wiring information .

Theory of Operation

The Totally Integrated Power Module (TIPM) controls the Daytime Running Lamps (DRL) relays by providing a ground path for the coil side of the relays. An ignition run circuit provides the supply voltage to the coil. For additional information on the Daytime Running Lamps operation, Exterior Lamps - Operation.

- When Monitored:
With the DRL active

- Set Condition:
When the TIPM detects a low condition on the (L157) Right Daytime Running Lamp Relay Control circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Start the engine.
4. With the brakes firmly applied, shift the gear selector into Drive.
5. With the scan tool, read DTCs.

Does the scan tool display DTC: B16D4-RIGHT DRL LAMP CONTROL CIRCUIT LOW?

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 RIGHT DRL RELAY
1. Shift the gear selector into Park.
2. Turn the ignition off.
3. Remove the Right DRL Relay and substitute it with a known good relay.
4. Turn the ignition on.
5. With the scan tool, clear all DTCs.
6. Start the engine.
7. With the brakes firmly applied, shift the gear selector into Drive.
8. With the scan tool, read DTCs.

Does the scan tool display DTC: B16D4-RIGHT DRL LAMP CONTROL CIRCUIT LOW?

Yes

- Go To 3

No

- Replace the Right DRL Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (L157) RIGHT DAYTIME RUNNING LAMP RELAY CONTROL CIRCUIT FOR AN OPEN
1. Shift the gear selector into Park.
2. Turn the ignition off.
3. Disconnect the TIPM C1 harness connector.
4. Measure the resistance of the (L157) Right Daytime Running Lamp Relay Control circuit between the TIPM C1 harness connector and the Right DRL Relay.

Is the resistance below 5.0 Ohms?

Yes

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

No

- Repair the open or high resistance in the (L157) Right Daytime Running Lamp Relay Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.