DTC B125D, B1800, or B1805

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 B125D Passenger Door Lock Actuator Unlock Control DTC B1800 Passenger Door Unlatch Motor Unlatch Control DTC B1805 Passenger Door Unlatch Motor Latch 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
1094	Control	1, 2	B1800 12, B1800 13	2	—
2680	Control	1, 2	B1800 12, B1800 13, B1805 12, B1805 13	1, 2	—
2682	Control	B125D 11	B125D 12, B125D 13	2	—
1. Passenger Door Latch Lock and Unlock Inoperative 2. Right Rear Door Latch Lock and Unlock Inoperative

Circuit/System Description The K9 Body Control Module provides the control circuit 1091, control circuit 1094, control circuit  2679, control circuit 2680, control circuit 2681 and control circuit 2682 with voltage and ground to the appropriate lock and unlock control circuits of the door latches. The lock and unlock control circuits of the left rear and driver door latches are connected together, the lock and unlock control circuits of the right rear and passenger door latches are connected together. 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 B125D 11 2682= short to ground B125D 12, B125D 13 2682= open/high resistance B1800 12, B1800 13 2680= open/high resistance 1094= open/high resistance B1805 12, B1805 13 2680= open/high resistance Actions Taken When the DTC Sets A23P Front Side Door Latch - Passenger & A23RR Rear Side Door Latch - Right — Lock & Unlock = 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 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 Scan Tool Reference Control Module References for scan tool information 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: A23P Front Side Door Latch - Passenger = Lock & Unlock ⇒ If the component does not activate Refer to: Circuit/System Testing — Test 1 ⇓ If all functions work properly
3. 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 — Test 2 ⇓ If all functions work properly
4. A fault is not currently present and may be an intermittent condition Circuit/System Testing Test 1
5. Ignition/Vehicle » Off
6. Disconnect the electrical connector: A23P Front Side Door Latch-Passenger
7. Connect a test lamp between the test points: Control circuit terminal 8 & ground
8. Ignition » On / Vehicle » In Service Mode
9. 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 control 2680 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 control 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 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 control 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
10. Connect a test lamp between the test points: Control circuit terminal 9 & ground
11. Ignition » On / Vehicle » In Service Mode
12. 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 control 2682 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 control 2682 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 control 2682 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
13. Test or replace the component: A23P Front Side Door Latch-Passenger Test 2
14. Ignition/Vehicle » Off
15. Disconnect the electrical connector: A23RR Rear Side Door Latch-Right
16. Connect a test lamp between the test points: Control circuit terminal 8 & ground
17. Ignition » On / Vehicle » In Service Mode
18. 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 control 2680 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 control 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 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 control 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
19. Connect a test lamp between the test points: Control circuit terminal 9 & ground
20. Ignition » On / Vehicle » In Service Mode
21. 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 control 1094 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 control 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 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 control 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
22. Test or replace the component: A23RR Rear Side Door Latch-Right Component Testing
23. Ignition/Vehicle » Off
24. Disconnect the appropriate electrical connector: A23P Front Side Door Latch - Passenger or A23RR Rear Side Door Latch - Right
25. Connect a 25 A fused jumper wire between the test points: Control terminal 8 & 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 9 & Ground
5. Reverse the jumper wires 2 times between the terminals. Verify the component works as specified: A23P Door Latch Assembly - Passenger = Lock & Unlock A23RR Rear Side Door Latch - Right = Lock & Unlock ⇒ If not the specified state Replace the component: A23P Door Latch Assembly - Passenger or 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 Front Side Door Latch Replacement Rear Side Door Latch Replacement For control module replacement, programming, and setup refer to: Control Module References