DTC B1919
Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B1919 Interior Door Handle Accent Lighting Control Refer to Symptom Byte List for symptom byte information. Diagnostic Fault Information
| Circuit | Circuit Type | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performan |
|---|---|---|---|---|---|
| 7557 | Control | B1919 11 | 1 | 1 | — |
| 1150 | Ground | — | 1 | — | — |
| 1250 | Ground | — | 1 | — | — |
| 1. Interior Accent Lamp Malfunction |
Circuit/System Description With the headlamp switch in the PARK or HEAD position, the park lamp switch signal circuit provides an input to the body control module (BCM). The BCM responds by applying voltage to the backlight dimming control circuits illuminating all components with interior backlighting. Conditions for Running the DTC Battery voltage must be between 9-16 V. Conditions for Setting the DTC The BCM detects a short to ground in the Interior Door Handle Accent Lighting Control circuit 7557. Actions Taken When the DTC Sets The BCM will disable the Interior Door Handle Accent Lighting Control circuit 7557. Conditions for Clearing the DTC The condition responsible for setting the DTC no longer exists. A history DTC will clear once 40 consecutive malfunction–free ignition cycles have occurred. Reference Information Schematic Reference Interior Lights Schematics Connector End View Reference Master Electrical Component List Description and Operation Interior Lighting Systems Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing
- Ignition OFF, disconnect the X5 connector at the K9 Body Control Module.
- Connect a 3 A fused jumper wire between control circuit terminal 15 and B+.
- Verify the door accent/flood lamps turn ON and OFF when connecting and disconnecting the jumper wire: {Chevrolet/GMC} E63LR Rear Side Door Inside Handle Illumination Lamp - Left {Cadillac} E55LR Rear Side Door Pocket Illumination Lamp - Left {Chevrolet/GMC} E63RR Rear Side Door Inside Handle Illumination Lamp - Right {Cadillac} E55RR Rear Side Door Pocket Illumination Lamp - Right ⇒ If the door accent/flood lamps are always OFF and the 3 A fuse is OK 3.1. Test the appropriate ground circuit for an open/high resistance: {Chevrolet/GMC} E63LR Rear Side Door Inside Handle Illumination Lamp - Left = Circuit 1150 {Cadillac} E55LR Rear Side Door Pocket Illumination Lamp - Left = Circuit 1150 {Chevrolet/GMC} E63RR Rear Side Door Inside Handle Illumination Lamp - Right = Circuit 1250 {Cadillac} E55RR Rear Side Door Pocket Illumination Lamp - Right = Circuit 1250 ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 3.2. Test control circuit 7557 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 3.3. Replace the door lamp. ⇒ If the door accent/flood lamps are always OFF and the 3 A fuse is OK 3.1. Test circuit 7557 for a short to ground. ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found 3.2. Replace the door lamp. ⇒ If the door accent/flood lamps are always ON 3.1. Test circuit 7557 for a short to voltage. ⇒ If a short to voltage is found, repair the fault on the circuit. ⇓ If a short to voltage is not found 3.2. Replace the door lamp. ⇓ If the door accent/flood lamps turn ON and OFF
- Replace the K9 Body Control Module. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Lighting Component Replacement Reference Control Module References for BCM replacement, programming, and setup