DTC B3888
Diagnostic Instructions
DTC Descriptors
DTC B3888 02: Trailer Right Indicator Circuit - Short to Ground
DTC B3888 05: Trailer Right Indicator Circuit - Short to Battery or Open
Circuit/System Description
When the right indicator switch is placed in the ON position, ground is applied to the auxiliary body control module (XBCM) through the indicator lamp switch circuit. The XBCM then applies voltage on the trailer indicator lamp circuit to the trailer right indicator lamp.
Conditions for Running the DTC
• | The right indicator lamps must be ON and the right indicator lamp must be commanded ON. |
Conditions for Setting the DTC
The body control module (BCM) detects an open, short to ground, or short to voltage on the trailer right indicator lamp circuit while trying to apply a voltage to the circuit.
Action Taken When the DTC Sets
The trailer right indicator lamp does not illuminate.
Conditions for Clearing the DTC
• | The conditions for setting the DTC are no longer present. |
• | A history DTC clears after 100 malfunction-free ignition cycles. |
• | The BCM receives the clear code command from the scan tool. |
Reference Information
Schematic Reference
Exterior Lamps Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, activate with a scan tool the Trailer Right Indicator Lamp switch, trailer right indicator lamp should illuminate.
Circuit/System Testing
- Inspect the trailer right indicator lamp bulb for an open or shorted filament.
⇒ | If the bulb is inoperable, replace the bulb. |
- Indicator lamp switch OFF. Clear the DTC. Test the trailer right indicator lamp circuit for a short to voltage, short to ground, an open, or high resistance.
⇒ | If all circuits/connections test normal, replace the XBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for XBCM replacement, setup, and programming
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