DTC B199C or B199D
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 B199C Left Turn Signal Lamp Control Circuit DTC B199D Right Turn Signal Lamp Control Circuit Refer to Symptom Byte List for symptom byte information. Diagnostic Fault Information
| Circuit | Circuit Function | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performan |
|---|---|---|---|---|---|
| 2114 | Control | B199C 11 | 1 | 1 | — |
| 2115 | Control | B199D 11 | 1 | 1 | — |
| 1150 | Ground | — | 1 | — | — |
| 650 | Ground | — | 1 | — | — |
| 1. Turn Signal Lamp Malfunction |
Scan Tool Functions K219 Lighting Control Module – Control Functions – Exterior Lighting
| Control Function | Description |
|---|---|
| Left Turn Signal Repeater Lamp Command | This control function will control the left mirror turn signal ON/OFF |
| Right Turn Signal Repeater Lamp Command | This control function will control the right mirror turn signal ON/OFF |
Circuit/System Description Ground is applied at all times to the turn signal switch. The turn signal lamps may only be activated with the ignition on/vehicle in service mode. When the turn signal switch is placed in either the turn right or turn left position, ground is applied to the K9 Body Control Module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by sending a serial data message to the K219 Lighting Control Module to command the appropriate turn signals ON and OFF. The Lighting Control Module responds by applying a pulsating voltage to the front, rear, and mirror turn signal lamps through their respective control circuits. When a turn signal request is received by the BCM, a serial data message is also sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF. Conditions for Running the DTC Battery voltage must be between 9-16 V. Conditions for Setting the DTC DTC B199C 11 The Lighting Control Module detects a short to ground on control circuit 2114. DTC B199D 11 The Lighting Control Module detects a short to ground on control circuit 2115. Actions Taken When the DTC Sets DTC B199C The left mirror turn signal is inoperative. DTC B199D The right mirror turn signal is inoperative. 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 Exterior Lights Schematics Connector End View Reference Master Electrical Component List Description and Operation Exterior 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 DTC B199C
- Ignition OFF, exterior lamps OFF, disconnect the A9A Outside Rearview Mirror – Driver.
- Verify a test lamp illuminates between ground circuit terminal 9 and B+. ⇒ If the test lamp does not illuminate 2.1. Repair the open/high resistance on the ground circuit or ground connection. ⇓ If the test lamp illuminates
- Connect a test lamp between the control circuit terminal 8 and ground, ignition ON.
- Verify the test lamp turns ON and OFF when commanding the Left Turn Signal Repeater Lamp Command ON and OFF with a scan tool. ⇒ If the test lamp is always OFF 4.1. Test circuit 2114 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 4.2. Test circuit 2114 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 4.3. Replace the K219 Lighting Control Module. ⇒ If the test lamp is always ON 4.1. Test circuit 2114 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 4.2. Replace the K219 Lighting Control Module. ⇓ If the test lamp turns ON and OFF
- Replace the left mirror turn signal lamp. DTC B199D
- Ignition OFF, exterior lamps OFF, disconnect the A9B Outside Rearview Mirror – Passenger.
- Verify a test lamp illuminates between ground circuit terminal 9 and B+. ⇒ If the test lamp does not illuminate 2.1. Repair the open/high resistance on the ground circuit or ground connection. ⇓ If the test lamp illuminates
- Connect a test lamp between the control circuit terminal 8 and ground, ignition ON.
- Verify the test lamp turns ON and OFF when commanding the Right Turn Signal Repeater Lamp Command ON and OFF with a scan tool. ⇒ If the test lamp is always OFF 4.1. Test circuit 2115 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 4.2. Test circuit 2115 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 4.3. Replace the K219 Lighting Control Module. ⇒ If the test lamp is always ON 4.1. Test circuit 2115 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 4.2. Replace the K219 Lighting Control Module. ⇓ If the test lamp turns ON and OFF
- Replace the right mirror turn signal lamp. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Lighting Component Replacement Reference Control Module References for BCM replacement, programming, and setup