PRE-RELEASE
DTC B250B
| DTC B250B |
| 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 Descriptors |
DTC B250B 01
Driver Door Unlatch Low Control Circuit Short to Battery
DTC B250B 02
Driver Door Unlatch Low Control Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Driver Exterior Door Lock Switch Signal
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B2516 02
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1
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1
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-
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Driver Door Unlatch High Control
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2
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2
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B250B 01
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-
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Driver Door Unlatch Low Control
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B250B 02
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2
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B250B 01
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-
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1. Door Lock Malfunction
2. Door Latch Malfunction |
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| Circuit/System Description |
When any exterior door handle is lifted, switched ground signals are sent to the keyless entry control module through the door handle switch signal circuits. Upon receipt of these inputs, the keyless entry control module will check the door lock status of the following inputs:
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Door unlock switch activation
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Keyless entry unlock command
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Passive keyless entry unlock command message is received by the keyless entry control module
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Once the enable criteria has been met, the keyless entry control module will supply power and ground to door latch control circuits and the door will release.
| Conditions for Running the DTC |
Battery voltage is between 9-16 V.
| Conditions for Setting the DTC |
B250B 01
The keyless entry control module detects a short to battery in the driver door unlatch motor unlatch control low circuit.B250B 02
The keyless entry control module detects a short to ground in the driver door unlatch motor unlatch control low circuit.| Action Taken When the DTC Sets |
The keyless entry control module ignores inputs from the driver exterior door handle switch.
| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| Reference Information |
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Door Locks 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, command the body control module Driver Door Unlatch to Unlatch and return to Idle. The driver door latch should Unlatch when commanded.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the A23D Door Latch Assembly - Driver.
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| 2. |
Ignition ON, verify that a test lamp does not illuminate between control circuit terminal 5 and ground.
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| 3. |
If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 4. |
Verify that a test lamp does not illuminate between control circuit terminal 10 and ground.
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| 5. |
If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 6. |
Verify that a test lamp does not illuminate between control circuit terminal 5 and B+.
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| 7. |
If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 8. |
Verify that a test lamp does not illuminate between control circuit terminal 10 and B+.
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| 9. |
If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 10. |
Connect a test lamp between the control circuit terminals 5 and 10.
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| 11. |
Verify the test lamp illuminates briefly, while pulling the exterior door handle.
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| 12. |
If the test lamp does not illuminate, test the control circuits for an open circuit/high resistance. If the circuits test normal, replace K84 Keyless Entry Control Module.
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| 13. |
If all circuits test normal, test or replace the A23D Door Latch Assembly - Driver.
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| Component Testing |
Driver Door Latch Test
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Ignition OFF, disconnect the harness connector at the A23D Door Latch Assembly - Driver.
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| 2. |
Install a 15 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the door latch should perform the Lock/Unlock functions.
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| 3. |
If it does not perform as specified, replace the A23D Door Latch Assembly - Driver.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Front Side Door Lock Replacement
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Control Module References
for keyless entry control module replacement, setup and programming
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