• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
I/P Fuse Block B+ | 1, 2, 3 | 1, 2, 3 | -- | -- |
Driver Door Lock Switch Lock Signal | B3150 00 | B3150 00 | B3150 00 | -- |
Driver Door Lock Switch Unlock Signal | B3140 00 | B3140 00 | B3140 00 | -- |
Passenger Door Lock Switch Lock Signal | B3155 00 | B3155 00 | B3155 00 | -- |
Passenger Door Lock Switch Unlock Signal | B3145 00 | B3145 00 | B3145 00 | -- |
Door Latch Control | 1, 2, 3 | 1, 2, 3 | 1, 2, 3 | -- |
Doors Unlocked Control | B3130 00 | B3130 00 | B3130 00 | -- |
LF Door Unlock Control | B3125 00 | B3125 00 | B3125 00 | -- |
Doors Locked Control | B3135 00 | B3135 00 | -- | -- |
Door Lock Switch Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
I/P Fuse Block Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
1. Door Lock Malfunction 2. Driver Door Unlock Malfunction 3. Door Unlock Malfunction |
The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the BCM senses a door lock/unlock switch activation or a keyless entry lock or unlock command.
The system voltage must be between 9-16 volts.
The BCM detects a short to ground in the left lock switch or unlock switch signal circuits.
The BCM detects a short to ground in the right lock switch or unlock switch signal circuits.
• | The BCM stores the DTC to memory. |
• | The power door locks will not operate. |
• | This DTC will change from current to history when the fault is no longer present. |
• | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Door Lock/Indicator Schematics
Power Door Locks Description and Operation
Control Module References for scan tool information
Ignition ON, observe the scan tool Driver Door Lock Sw, Psgr Door Lock Sw, Driver Door Unlock Sw and Psgr Door Unlock Sw. parameters while using the appropriate door lock switch. The reading should change between Inactive and Active.
⇒ | If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If less than the specified value, replace the door lock switch. |
⇒ | If greater than the specified range, replace the door lock switch. |
⇒ | If greater than the specified range, replace the door lock switch |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup and programming |