DTC B3950 or B3951 |
Diagnostic Instructions |
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
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Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
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Diagnostic Procedure Instructions has overviews of all diagnostic categories. |
DTC Descriptors |
Diagnostic Fault Information |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Left Rear Turn Signal |
B3950 02 |
B3950 04 |
1 |
- |
Right Rear Turn Signal |
B3951 02 |
B3951 04 |
1 |
- |
1. Rear Turn Signal Always ON |
Circuit/System Description |
Conditions for Running the DTC |
Conditions for Setting the DTC |
Action Taken When the DTC Sets |
Conditions for Clearing the DTC |
Reference Information |
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Circuit/System Verification |
Circuit/System Testing |
1. |
Ignition OFF, disconnect the harness connector at the appropriate turn signal lamp listed below: |
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E5E Tail Lamp - Left harness connector X1 |
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E5F Tail Lamp - Right harness connector X1 |
2. |
Test for less than 5 Ω between the appropriate turn signal lamp ground circuit harness connector listed below and ground. |
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E5F Tail Lamp - Right ground circuit harness connector terminal F |
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E5E Tail Lamp - Left ground circuit harness connector terminal F |
3. |
If greater than the specified range, test the ground circuit for an open/high resistance. |
4. |
Connect a test lamp between the appropriate turn signal lamp control circuit harness connector listed below and ground. |
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E5F Tail Lamp - Right Turn Signal Lamp circuit harness connector terminal B |
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E5E Tail Lamp - Left Turn Signal Lamp circuit harness connector terminal B |
5. |
Command the appropriate Turn Signal Lamp test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. |
6. |
If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module. |
7. |
If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 Body Control Module. |
8. |
If all the circuits test normal, replace the appropriate turn signal lamp. |
Repair Instructions |
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Tail Lamp Replacement
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Control Module References for information on BCM replacement, setup, and programming
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