B162B-LEFT LOW BEAM CONTROL CIRCUIT LOW
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For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Totally Integrated Power Module (TIPM) receives a bus message requesting low beam lamp illumination. When this bus message is received, the TIPM provides a voltage output through the low beam driver circuit. The low beam driver circuit connects to the Low Beam Lamp. A headlamp return signal circuit is used instead of a ground circuit.
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When Monitored:
With the low beam headlamps active.
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Set Condition:
When the Totally Integrated Power Module (TIPM) detects a low condition on the (L43) Left Low Beam Driver circuit.
Possible Causes |
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| (L43) LEFT LOW BEAM DRIVER CIRCUIT SHORTED TO GROUND |
| (L43) LEFT LOW BEAM DRIVER CIRCUIT SHORTED TO THE (L911) LEFT HEADLAMP RETURN SIGNAL CIRCUIT |
| LEFT LOW BEAM BULB |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
| 1. | Turn the ignition on. |
| 2. | With the scan tool, clear all DTCs. |
| 3. | Turn the Headlamps on. |
| 4. | With the scan tool, read DTCs. |
Does the scan tool display DTC: B162B-LEFT LOW BEAM 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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
2. ATTEMPT TO SET THE OPPOSITE DTC
| 1. | Turn the ignition off. |
| 2. | Disconnect the Left Headlamp Lamp harness connector. |
| 3. | Turn the ignition on. |
| 4. | With the scan tool, read DTCs. |
Does the scan tool display DTC: B162C-LEFT LOW BEAM CONTROL CIRCUIT HIGH?
Yes
- Replace the Left Low Beam Bulb in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Go To 3
3. CHECK THE (L43) LEFT LOW BEAM DRIVER CIRCUIT FOR A SHORT TO GROUND
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| 1. | Turn the ignition off. |
| 2. | Disconnect the TIPM C3 harness connector. |
| 3. | Measure the resistance between ground and the (L43) Left Low Beam Driver circuit. |
Is the resistance above 10k Ohms?
Yes
- Go To 4
No
- Repair the short to ground in the (L43) Left Low Beam Driver circuit.
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Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).
4. CHECK THE (L43) LEFT LOW BEAM DRIVER CIRCUIT FOR A SHORT TO THE (L911) LEFT HEADLAMP RETURN SIGNAL CIRCUIT
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| 1. | Measure the resistance between the (L43) Left Low Beam Driver circuit and the (L911) Left Headlamp Return Signal circuit. |
Is the resistance above 10k Ohms?
Yes
- Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Repair the short between the (L43) Left Low Beam Driver circuit and the (L911) Left Headlamp Return Signal circuit.
-
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).