PRE-RELEASE
DTC B3650
| DTC B3650 |
| 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.
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| DTC Descriptor |
DTC B3650 08
High Beam Request Signal Circuit Performance - Signal Invalid
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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High Beam Request Signal
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B3650 08
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| Circuit/System Description |
When the low beam is activated and the turn signal/multifunction switch is placed in the high beam position, the body control module (BCM) will receive a ground signal through the turn signal/multifunction switch signal circuit to illuminate the high beam lamps.
| Conditions for Running the DTC |
Low beam is ON and high beam is activated.
| Conditions for Setting the DTC |
The body control module (BCM) reports stuck turn signal/multifunction switch.
| Action Taken When the DTC Sets |
The BCM will not attempt to switch ON the high beam lamps.
| Conditions for Clearing the DTC |
The condition for setting the DTC is no longer present.
| Reference Information |
Schematic Reference
Exterior Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
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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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Scan Tool Reference
Control Module References for information on diagnostic tools
| Circuit/System Verification |
Ignition ON, turn the headlamp switch in the low beam position. Push/pull the turn signal/multifunction switch between the ON/OFF position. The high beam lamps should be ON/OFF as the switch is cycled.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the S78 Turn Signal/Multifunction Switch harness connector. Test for less than 5 Ω between the ground circuit terminal 3 and ground.
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| 2. |
If greater then the specified value, test the ground circuit for an open circuit/high resistance.
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| 3. |
Connect the S78 Turn Signal/Multifunction Switch harness connector.
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| 4. |
Disconnect the X3 harness connector at the K9 Body Control Module.
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| 5. |
Connect a test lamp between B+ and the signal circuit terminal 11 X3.
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| 6. |
Push/pull the S78 Turn Signal/Multifunction Switch between the high beam and OFF position. The test lamp should turn ON and OFF as the switch is cycled.
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| 7. |
If the test lamp is always OFF, test the signal circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the S78 Turn Signal/Multifunction Switch.
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| 8. |
If the test lamp is always ON, test the signal circuit for a short to ground. If the circuit test normal, replace the S78 Turn Signal/Multifunction Switch.
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| 9. |
If all circuits test normal, replace the K9 Body Control Module.
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| Component Testing |
Static Test
| 1. |
Ignition OFF, disconnect the S78 Turn Signal/Multifunction Switch harness connector. S78 Turn Signal/Multifunction Switch in position for headlamp flasher, test for less than 5 Ω between connection 4 and connection 3.
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| 2. |
If greater than the specified value, replace the S78 Turn Signal/Multifunction Switch.
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| 3. |
S78 Turn Signal/Multifunction Switch in high beam position, test for less than 5 Ω between terminal 2 and terminal 3.
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| 4. |
If greater than the specified value, replace the S78 Turn Signal/Multifunction Switch.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Headlamp Switch Replacement
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Turn Signal Multifunction Switch Replacement
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Control Module References
for information on BCM replacement, setup, and programming
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