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DTC B3797

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.

DTC Descriptor

DTC B3797 02: All Door Dead Lock Circuit Short to Ground

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Security Lock Relay Control

B3797 02

2

2

--

Door Lock Control

B3125 02, B3130 02, B3135 02

2

2

--

Door Double Lock Actuator Lock Control

B3125 02, B3130 02, B3135 02

1

1

--

Door Lock Actuator Unlock Control

B3125 02, B3130 02, B3135 02

1

1

--

Underbonnet Fuse Block Ground

--

2

--

--

1. Door Lock/Unlock Malfunction

2. Door Dead Lock Malfunction

Circuit/System Description

When the body control module (BCM) receives a command to activate the door dead locks, the BCM will apply voltage to the DOOR LK SEC pcb relay. This will energise the relay closing the contacts and enable the BCM to supply voltage to the dead locks in each of the doors.

Conditions for Running the DTC

The system voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground on the door lock security relay control circuit.

Action Taken When the DTC Sets

The dead locks will be inoperative

Conditions for Clearing the DTC
    • The DTC will be current for as long as the fault is present.
    • When the fault is no longer present, the DTC will be a history DTC.
    • A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

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

Command the doors to LOCK with a scan tool and manually unlock each door, attempt to open the door by using the exterior door handles. The exterior door handles should be inoperative.

Circuit/System Testing
  1. Ignition OFF, disconnect the X1 harness connector at the X50U fuse block-underbonnet.
  2. Test for less than 30 Ω between the ground circuit terminal 71 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect the X1 harness connector and disconnect the X2 harness connector at the X50U fuse block-underbonnet.
  4. Connect a test lamp between the control circuit terminal 48 and ground.
  5. Ignition ON, command the door dead locks to LOCK and UNLOCK with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    6. ⇒If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
    ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  6. If all circuit tests normal, replace the X50U fuse block-underbonnet.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuse Block Replacement
    • Control Module References for BCM replacement, setup and programming
   


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