For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Totally Integrated Power Module (TIPM) receives a bus message requesting high beam lamp illumination. When this bus message is received, the TIPM provides a voltage output through the high beam driver circuit. The high beam driver circuit connects to the High Beam Lamp. A headlamp return signal circuit is used instead of a ground circuit.
When Monitored:
With the high beam headlamps active.
Set Condition:
When the Totally Integrated Power Module (TIPM) detects a high condition on the (L34) Right High Beam Driver circuit.
Possible Causes
(L34) RIGHT HIGH BEAM DRIVER CIRCUIT OPEN
(L34) RIGHT HIGH BEAM DRIVER CIRCUIT SHORTED TO VOLTAGE
(L910) RIGHT HEADLAMP RETURN SIGNAL CIRCUIT OPEN
RIGHT HIGH BEAM BULB
TOTALLY INTEGRATED POWER MODULE (TIPM)
1.
INTERMITTENT CONDITION
1.
Turn the ignition on.
2.
With the scan tool, clear all DTCs.
3.
Turn the High Beam Headlamps on.
4.
With the scan tool, read DTCs.
Does the scan tool display DTC: B1638-RIGHT HI BEAM CONTROL CIRCUIT HIGH?
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.
Connect a 12-volt test light between the (L34) Right High Beam Driver circuit and (L910) Right Headlamp Return Signal circuit in the Right Headlamp Lamp harness connector.
4.
Turn the ignition on.
5.
Turn the High Beam Headlamps on.
Does the test light illuminate brightly?
Yes
Replace the Right High Beam Bulb in accordance with the Service Information.
4.
CHECK THE (L34) RIGHT HIGH BEAM DRIVER CIRCUIT FOR AN OPEN IN THE HARNESS
1.
Turn the ignition off.
2.
Disconnect the TIPM C3 harness connector.
3.
Measure the resistance of the (L34) Right High Beam Driver circuit between the Right Headlamp Lamp harness connector and the TIPM C3 harness connector.
5.
CHECK THE (L910) RIGHT HEADLAMP RETURN SIGNAL CIRCUIT FOR AN OPEN IN THE HARNESS
1.
Measure the resistance of the (L910) Right Headlamp Return Signal circuit between the Right Headlamp Lamp harness connector and the TIPM C3 harness connector.
Is the resistance below 5.0 Ohms?
Yes
Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
