vauxhall Workshop Repair Guides

Vauxhall Workshop Service and Repair Manuals

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DTC P0396, P03A0, P03AA, or P03B4 > < DTC P161F

Astra J

DTC P257E or P257F

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 Descriptors

DTC P257E 00:  Engine Bonnet Switch Circuit Low Voltage

DTC P257F 00:  Engine Bonnet Switch Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Bonnet Ajar Switch Signal

P257E 00

P257F 00

P257F 00

-

Ground

-

P257F 00

-

-

Circuit/System Description

The engine control module (ECM) monitors the voltage input of the bonnet ajar switch signal circuit.

Conditions for Running the DTC

The ECM continuously monitors for this DTC.

Conditions for Setting the DTC

B257E 00

The ECM detects that the bonnet ajar switch signal circuit is shorted to ground.

B257F 00

The BCM detects that the bonnet ajar switch signal circuit is shorted to voltage or open.

Action Taken When the DTC Sets

Prevent the Stop/Start function.

Conditions for Clearing the DTC

A current DTC will clear when the conditions for setting are no longer present.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Stop/Start System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool ECM Bonnet Position parameter. With the bonnet open, the Bonnet Position parameter should read open. With the bonnet closed, the Bonnet Position parameter should read closed.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B55 Bonnet Ajar Switch.
  2. Ignition OFF, test for less than 8 Ω between the ground circuit terminal C and ground.
    3. ⇒ If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for greater 11 V between the signal circuit terminal A and ground.
    4. ⇒ If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the B55 Bonnet Ajar Switch.
  4. If all circuits test normal, test or replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Module References for ECM replacement, programming and setup

DTC P0396, P03A0, P03AA, or P03B4 > < DTC P161F