DTC B11A2, B11A3, or B1804

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 B11A2 Left Rear Door Lock Actuator Lock Control DTC B11A3 Left Rear Door Lock Actuator Unlock 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, B171C 13, B1803 12, B1803 13, B1805 12, B1805 13	B11A2 12, B11A2 13, B11A4 13, B11A4 12, B125D 12, B125D 13, B171C 12, B171C 13, B1803 12, B1803 13, B1805 12, B1805 13	—	—
1091	Control	B11A2 11	B11A2 12, B11A2 13	—	—
2679	Control	B11A3 11	B11A2 12, B11A2 13, B11A3 12, B11A3 13, B1804 12, B1804 13	—	—
1 Left rear door Lock and Unlock functions inoperative

Circuit/System Description The K9 Body Control Module provides the control circuit 1091 and control circuit 2679 with voltage and ground to the appropriate lock and unlock control circuits of the door latches. The unlock control circuit of the left rear and driver door latches share a common control circuit 2679. 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 B11A2 11 Circuit 1091= Short to ground B11A2 12, B11A2 13 Circuit 1091= Short to battery or open/high resistance B11A2 12, B11A2 13, B11A3 12, B11A3, 13 Circuit 2679= Short to battery or open/high resistance Actions Taken When the DTC Sets A23LR Rear Side Door Latch - Left = 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: A23LR Rear Side Door Latch - Left = Lock & Unlock ⇒ If the component does not activate Refer to: Circuit/System Testing ⇓ If all functions work properly
3. A fault that is not currently present may have been caused by a intermittent condition. Circuit/System Testing
4. Ignition/Vehicle » Off
5. Disconnect the electrical connector: A23LR Rear Side Door Latch-Left
6. Connect a test lamp between the test points: Control circuit terminal 7 & ground
7. Ignition » On / Vehicle » In Service Mode
8. 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 1091 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 1091 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 1091 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
9. Connect a test lamp between the test points: Control circuit terminal 8 & ground
10. Ignition » On / Vehicle » In Service Mode
11. 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 2679 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 2679 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 2679 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
12. Test or replace the component: A23LR Rear Side Door Latch-Left Component Testing
13. Ignition/Vehicle » Off
14. Disconnect the electrical connector: A23LR Rear Side Door Latch - Left
15. Connect a 25 A fused jumper wire between the test points: Control terminal 7 & 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: A23LR Rear Side Door Latch - Left = Lock & Unlock ⇒ If not the specified state Replace the component: A23LR Rear Side Door Latch - Left ⇓ 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