B1831

B1831-ALL DOOR UNLOCK OUTPUT CIRCUIT SHORTED TO GROUND - CLUSTER

B1831 - All Door Unlock Output Circuit Shorted To Ground - Cluster:

WHEN MONITORED
Whenever the cluster is awake.

SET CONDITION
The cluster monitors the door unlock output circuits and when one of them is shorted to ground, this code will set. This DTC will only set when the door locks are unlocked.

POSSIBLE CAUSES
- (G778) Door unlock driver right doors circuit shorted to ground
- (P5) Door unlock driver left rear/liftgate circuit shorted to ground
- (G778) Door unlock driver right doors short to (P392) door lock driver right doors
- (P393) Door lock driver left doors short to (P5) door unlock driver left rear/liftgate
- Cluster

Theory of Operation
The Door Unlock Driver Right Doors circuit and the Door Unlock Driver Left Rear/Liftgate circuits are connected together inside the module. Therefore any circuit that is connected to either one can set this code.

Diagnostic Test

1.CHECK FOR ACTIVE DTC B1831-ALL DOOR UNLOCK OUTPUT CIRCUIT SHORTED TO GROUND




Turn the ignition on.
With the scan tool, record and erase DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
Try to operate the door locks several times.
With the scan tool, read active DTC's.

Q: Does the scan tool display: B1831-ALL DOOR UNLOCK OUTPUT CIRCUIT SHORTED TO GROUND

YES: Go To 2
NO: The condition that caused this code to set is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the system several times and recheck for active DTC's.

2. CHECK (G778) DOOR UNLOCK DRIVER RIGHT DOORS FOR SHORT TO GROUND





NOTE: If only one motor is inoperative when the door locks are actuated, disconnect that motor and retest to see if the DTC is still present. If it is not, replace the defective motor.

Turn the ignition off.
Disconnect the Cluster C1 connector.
Measure the resistance between ground and the (G778) Door Unlock Driver Right Doors circuit.

Q: Is the resistance below 1000.0 ohms?

NO: Go To 3
YES: Repair the (G778) Door Unlock Driver Right Doors circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. CHECK THE (P5) DOOR UNLOCK DRIVER LEFT REAR/ LIFTGATE FOR A SHORT TO GROUND




Measure the resistance between ground and the (P5) Door Unlock Driver Left Rear/Liftgate circuit.

Q: Is the resistance below 1000.0 ohms?

NO: Go To 4
YES: Repair the (P5) Door Unlock Driver Left Rear/Liftgate circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. CHECK THE (P392) DOOR LOCK DRIVER RIGHT DOORS CIRCUIT FOR A SHORT TO THE (G778) DOOR UNLOCK DRIVER RIGHT DOORS CIRCUIT




Measure the resistance between the (P392) Door Lock Driver Right Doors circuit and the (G778)Door Unlock Driver Right Doors circuit.

Q: Is the resistance below 1.6 ohms?

NO: Go To 5
YES: Repair the (P392) Door Lock Driver Right Doors circuit for a short to the (G778) Door Unlock Driver Right Doors circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5. CHECK THE (P393) DOOR LOCK DRIVER LEFT DOORS CIRCUIT FOR A SHORT TO THE (P5) DOOR UNLOCK DRIVER LEFT REAR/LIFTGATE CIRCUIT




Measure the resistance between the (P393) Door Lock Driver Left Doors circuit and the (P5) Door Unlock Driver Left Rear/Liftgate circuit.

Q: Is the resistance below 1.6 ohms?

NO: Replace the Cluster. Perform BODY VERIFICATION TEST - VER 1
YES: Repair the (P393) Door Lock Driver Left Doors circuit for a short to the (P5) Door Unlock Driver Left Rear/Liftgate circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test