DTC B11A4, B11A5, or B1802

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC B11A4 Right Rear Door Lock Actuator Lock Control Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit number	Circuit Function	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performan
2540	B+	B11A2 12, B11A2 13, B11A4 13, B11A4 12, B125D 12, B125D 13, B171C 12, B171 13, B1803 12, B1803 13, B1805 12, B1805 13	B11A2 12, B11A2 13, B11A4 13, B11A4 12, B125D 12, B125D 13, B171C 12, B171 13, B1803 12, B1803 13, B1805 12, B1805 13	—	—
2680	Control	1	1	—	—
1094	Control	B11A4 11	B11A4 12, B11A4 13	—	—
1 Right rear door Lock and Unlock functions inoperative

Circuit/System Description The K9 Body Control Module provides the control circuit 1094 and control circuit 2680 with voltage and ground to the appropriate lock and unlock control circuits of the door latches. The unlock control circuit of the right rear and passenger door latches share a common control circuit 2680. Transitioning of the lock actuators to the lock or unlocked position depends upon which control circuits receive voltage and which control circuits receive ground. Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Conditions for Setting the DTC B11A4 12, B11A4 13 Circuit 1094= Short to battery or open/high resistance B11A4 12, B11A4 13 Circuit 2680= Short to battery or open/high resistance Actions Taken When the DTC Sets A23RR Rear Side Door Latch - Right = Inoperative Conditions for Clearing the DTC A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Reference Information Schematic Reference Door Lock/Indicator Schematics Body Control System Schematics Connector End View Reference Master Electrical Component List Description and Operation Power Door Locks Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Electrical Relay Replacement Scan Tool Reference Control Module References Circuit/System Verification

1. Ignition » On / Vehicle » In Service Mode
2. Operate the component: S13D Door Lock Switch - Driver » Lock Switch & Unlock Switch Verify the component works as specified: A23RR Rear Side Door Latch - Right = Lock & Unlock ⇒ If the component does not activate Refer to: Circuit/System Testing ⇓ If all functions work properly
3. A fault is not currently present and may be an intermittent condition Circuit/System Testing
4. Disconnect the electrical connector: A23RR Rear Side Door Latch - Right
5. Connect a test lamp between the test points: Control circuit terminal 9 & ground
6. Ignition » On / Vehicle » In Service Mode
7. Operate the component: S13D Door Lock Switch - Driver Verify the test lamp state: Not used= Test lamp Off Lock Switch » Pressed = Test lamp flashes ON and OFF ⇒ If the test lamp is always OFF 5.1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module 5.2. Test for infinite resistance between the circuit 1094 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 5.3. Test for less than 2 Ω in the circuit 1094 end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K9 Body Control Module ⇒ If the test lamp is always ON 5.1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. 5.2. Test for less than 1 V between the circuit 1094 and ground. ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, replace the K9 Body Control Module ⇓ If the test lamp turns ON and OFF
8. Connect a test lamp between the test points: Control circuit terminal 8 & ground
9. Ignition » On / Vehicle » In Service Mode
10. Operate the component: S13D Door Lock Switch - Driver Verify the test lamp state: Not used= Test lamp Off Unlock» Pressed = Test lamp flashes ON and OFF ⇒ If the test lamp is always OFF 8.1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module 8.2. Test for infinite resistance between the circuit 2680 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 8.3. Test for less than 2 Ω in the circuit 2680 end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K9 Body Control Module ⇒ If the test lamp is always ON 8.1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. 8.2. Test for less than 1 V between the circuit 2680 and ground. ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, replace the K9 Body Control Module ⇓ If the test lamp turns ON and OFF
11. Test or replace the component: A23RR Rear Side Door Latch - Right Component Testing
12. Ignition/Vehicle » Off
13. Disconnect the electrical connector: A23RR Rear Side Door Latch - Right
14. Connect a 25 A fused jumper wire between the test points: Control terminal 9 & B+

Caution

Complete the testing as quickly as possible in order to prevent overheating and damaging the component.

4. Momentarily connect a jumper wire between the test points: Control terminal 8 & Ground
5. Reverse the jumper wires 2 times between the terminals. Verify the component works as specified: A23RR Rear Side Door Latch - Right = Lock & Unlock ⇒ If not the specified state Replace the component: A23RR Rear Side Door Latch - Right ⇓ If the specified state
6. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Rear Side Door Latch Replacement For control module replacement, programming, and setup refer to: Control Module References