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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Key Switch Signal | B3062 02, or B3067 02 | 1 | 1 | -- |
Driver Door Latch Ground | -- | 1 | -- | -- |
1. Door Lock Key Cylinder Switch Inoperative | ||||
Circuit/System Description
The driver door key switch is contained within the driver door latch. The driver door key cylinder switch contacts, which are normally open. When the door key is turned to unlock, the switch contacts close and the driver door module (DDM) detects a switched ground. The DDM sends a message via serial data to the remote control door lock receiver (RCDLR), indicating the key cylinder unlock switch request. The RCDLR is the master of all lock and unlock operations. If the RCDLR determines that the key cylinder unlock switch request is valid and conditions are correct for the door modules to perform the unlock function, it sends a message via serial data back to all door modules to unlock all doors.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
- Ignition ON, command the doors to LOCK and UNLOCK by using the driver door lock switch, all doors should perform the LOCK and UNLOCK functions.
- Observe the scan tool Door Cylinder Switch parameters while the turning and holding the key in the driver door lock cylinder to the left and then to the right, parameter should change from Idle to Unlock.
| ⇒ | If any door fails to LOCK or UNLOCK, refer to Power Door Locks Inoperative. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver door latch.
- Test for less than 10 ohms between the ground circuit listed below and ground.
- Ignition ON, verify the scan tool Door Cylinder Switch parameter is Idle.
- Install a 3A fused jumper wire between the signal circuit terminal listed below and the ground. Verify the scan tool Door Cylinder Switch parameter is Unlock.
- If all circuits test normal, test or replace the driver door latch.
| • | Right hand drive ground circuit terminal 3 |
| • | Left hand drive ground circuit terminal 8 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the DDM. |
| • | Right hand drive signal circuit terminal 4 |
| • | Left hand drive signal circuit terminal 9 |
| • | Right hand drive signal circuit terminal 4 |
| • | Left hand drive signal circuit terminal 9 |
| ⇒ | If not one of the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the driver door latch.
- Test for infinite resistance between the terminals listed below with the switch in the Idle position.
- Test for less than 2 ohms between the terminals listed below with the switch in the Unlock position.
| • | Right hand drive terminals 4 and 3 |
| • | Left hand drive terminals 9 and 8 |
| ⇒ | If not the specified value, replace the driver door latch. |
| • | Right hand drive terminals 4 and 3 |
| • | Left hand drive terminals 9 and 8 |
| ⇒ | If greater than the specified range, replace the driver door latch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for DDM replacement, setup, and programming |
