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Home >> Chrysler >> 2004 >> Pacifica AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures - Communication, Door Ajar, Electrically Heated Systems, Exterior Lighting >> Exterior Lighting >> Symptom: HEADLAMP SWITCH INPUT OPEN-BCM >> Diagnostic Procedure

Diagnostic Procedure

HEADLAMP SWITCH INPUT OPEN-BCM - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIII®, clear all BCM DTC's.
Turn the headlamps to the ON position.
With the DRBIII®, read DTCs.
Does the DRBIII® display HEADLAMP SWITCH INPUT OPEN?
  1. Yes: Go To 2
  2. No: Go To 5
 All
2 Turn the ignition off.
Disconnect the Headlamp Switch harness connector.
Connect a jumper wire between the Headlamp Switch MUX circuit and the Headlamp Switch MUX Return circuit in the Headlamp Switch harness connector.
Turn the ignition on.
With the DRBIII®, select Body, Body Controller and read the Headlamp Switch volts.
Does the DRBIII® Headlamp Switch Sensor voltage read less than 0.5 Volts?
  1. Yes: Replace the Headlamp Switch in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 3
 All
3 Turn the ignition off to the lock position.
Disconnect the Body Control Module C5 harness connector.
Disconnect the Headlamp Switch harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Headlamp Switch MUX circuit from the Body Control Module connector to the Headlamp Switch harness connector.
Is the resistance above 5.0 ohms?
  1. Yes: Repair the Headlamp Switch MUX circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 4
 All
4 Turn the ignition off to the lock position.
Disconnect the Body Control Module C5 harness connector.
Disconnect the Headlamp Switch harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Headlamp Switch MUX Return circuit from the Body Control Module connector to the Headlamp Switch harness connector.
Is the resistance above 5.0 ohms?
  1. Yes: Repair the Headlamp Switch MUX Return circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Replace the Body Control Module in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

 All
5 The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?
  1. Yes: Repair as necessary.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Test Complete.
 All
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