B2203

DTC B2203 Driver Door Unlock Circuit:

CIRCUIT DESCRIPTION
The driver door unlock circuit is completed by the Body Control Module (BCM) when it receives a driver door unlock request from any of the door lock switches or the Remote Keyless Entry (RKE) transmitter. The BCM momentarily grounds circuit 1391, energizing the door lock relay. If the BCM detects a short to voltage, a fault condition is present and a DTC will set.

CONDITIONS FOR SETTING THE DTC
^ BCM detects a short to voltage in circuit 1391 while attempting to ground circuit 1391.
^ The BCM can only test for this condition when the BCM attempts to unlock the drivers door.
^ All conditions must he present for more than 0.15 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC B2203 in the BCM memory.
^ The BCM turns off its output to the door lock relay.
^ No driver warning message will he displayed for this DTC.

CONDITIONS FOR CLEARING THE DTC
^ When the ignition is cycled from the OFF position and then to the RUN position, the current DTC is cleared. If the fault is present at the next unlock activation the current DTC is set.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Using a scan tool.

DIAGNOSTIC AIDS
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to voltage in circuit 1391.
- An intermittent short to voltage in the BCM.
- Door lock relay coil shorted to voltage internally.
^ If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while moving wiring and connectors, this can often cause the malfunction to appear.
^ DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is in the RUN position with the BCM disconnected.

TEST DESCRIPTION
Numbers below refer to the step numbers on the diagnostic table.
1. Always perform the BCM Diagnostic System Check before attempting to diagnose a DTC B2203.
2. Checks for a short to B+ in circuit 1391.
3. Determines if there is a short to B+ in circuit 1391 or the BCM.
6. Checks BCM DTC B2203 and checks for BCM DTC B2203 to set again.