B2697

DTC B2697

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B2697
- Headlamp Washer Request Circuit

Circuit/System Description

The headlamp washer switch signal circuit is supplied a B+ reference through a resistor then monitored within the body control module (BCM). The headlamp washer switch is open when in an inactive state. When the headlamp washer switch is activated the signal circuit is closed to ground. When the headlamp washer switch signal circuit is closed to ground the reference voltage is dropped across the resistor within the BCM. The low voltage on the headlamp washer switch signal circuit indicates to the BCM the switch status is active.

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The headlamp washer switch signal to the BCM is low longer than 10 seconds.

Action Taken When the DTC Sets

The headlamp washers will be disabled for as long as the DTC is current.

Conditions for Clearing the DTC

* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.

Circuit/System Verification

Ignition ON, observe the Headlamp Wash parameter while pressing and releasing the headlamp wash switch. The reading should change between On and Off.

Circuit/System Testing

1. Ignition OFF, disconnect the X1, X2 harness connectors at the headlamp switch.
2. Test for less than 1.0 ohm of resistance between the ground circuit terminal C X1 and ground.

^ If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Headlamp Wash parameter is Off.

^ If not the specified value, test the signal circuit terminal H X2 for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between the signal circuit terminal H X2 and the ground circuit terminal C X1. Verify the scan tool Headlamp Wash parameter is On.

^ If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, test or replace the headlamp switch

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Headlamp Switch Replacement