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Home >> Jeep >> 2004 >> Wrangler X, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures >> Diagnostic Information And Procedures >> Airbag >> Symptom: LOSS OF IGNITION RUN - START >> Diagnostic Procedure

Diagnostic Procedure

LOSS OF IGNITION RUN - START - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1 Ensure the battery is fully charged.
Turn the ignition on.
NOTE: For the purpose of this test, the AECM and ORC modules will be referred to as an ACM.

DETERMINE ACTIVE OR STORED DTC:
  1. ACM - ACTIVE DTC Go To 2
  2. ACM - STORED DTC Go To 10
NOTE: When reconnecting Airbag system components, the ignition must be turned off and the battery must be disconnected.
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2 Turn Ignition off.
Remove and inspect the Airbag Run-Start Fuse.
NOTE: Check connectors - Clean and repair as necessary.

Is the Fuse open?
  1. Yes : Go To 3
  2. No : Go To 8
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3 Measure the resistance of the Fused Ignition Switch Output Run-Start circuit between the Airbag Run - Start Fuse and ground.
Is the resistance below 10.0 ohms?
  1. Yes : Go To 4
  2. No : Replace Airbag Run - Start Fuse. Perform AIRBAG VERIFICATION TEST .
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4 Is this vehicle equipped with a Passenger Airbag On - Off Switch?
  1. Yes : Go To 5
  2. No : Go To 7
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5 Disconnect the Passenger Airbag On - Off Switch connector
NOTE: Check connectors - Clean and repair as necessary.

Measure the resistance of the Fused Ignition Switch Output Run-Start Circuit between the On - Off Switch connector and
ground. Is the resistance below 10K ohms?
  1. Yes : Go To 6
  2. No : Replace the Passenger Airbag On - Off Switch and Airbag Run - Start Fuse.

    Perform AIRBAG VERIFICATION TEST .

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6
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
Disconnect the Airbag Control Module connector.
NOTE: Check connectors - Clean and repair as necessary.
Connect the Airbag Load Tool ACM Adaptor to the Airbag Control Module connector. Measure the resistance of the Fused Ignition Switch Output Run-Start circuit between the Airbag Control Module connector and ground.Is the resistance below 10K ohms?
  1. Yes : Repair the Fused Ignition Switch Output Run - Start circuit short to ground. Perform AIRBAG VERIFICATION TEST .
  2. No : Go To 11
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7
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
Disconnect the Airbag Control Module connector
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the Fused Ignition Switch Output Run-Start circuit between the Airbag Control Module connector and ground. Is the resistance below 10K ohms?
  1. Yes : Repair the Fused Ignition Switch Output Run - Start circuit short to ground. Perform AIRBAG VERIFICATION TEST .
  2. No : Go To 11
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8 Turn the ignition on.
Measure the voltage of the Ignition Switch Output circuit at the Airbag Run - Start fuse.
Is the voltage above approximately 4.5 volts?
  1. Yes : Go To 9
  2. No : Repair the open Ignition Switch Output Run - Start circuit. Perform AIRBAG VERIFICATION TEST .
NOTE: Reinstall the fuse after performing this test.
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9
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
Disconnect the Airbag Control Module connector.
NOTE: Check connectors - Clean and repair as necessary.
Reinstall the previously removed Airbag Run-Start Fuse.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Measure the voltage of the Fused Ignition Switch Output Run-Start Circuit between the Airbag Control Module connector ground.Is the voltage above approximately 4.5 volts?
  1. Yes : Go To 11
  2. No : Repair open Fused Ignition Switch Output Run-Start circuit. Perform AIRBAG VERIFICATION TEST .
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10 With the DRBIII®, record and erase all DTC's from all Airbag modules.
If equipped with Passenger Airbag On - Off switch, read the DTC's in all switch positions.
If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Look for chaffed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
The following additional checks may assist you in identifying a possible intermittent problem.
Reconnect any disconnected components and harness connector
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.

With the DRBIII® monitor active codes as you work through the following steps.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, MAINTAIN A SAFE DISTANCE FROM ALL AIRBAGS WHILE PERFORMING THE FOLLOWING STEPS.

Wiggle the wiring harness and connectors of the related airbag circuit or component.
If codes are related to the Driver Airbag circuits, rotate the steering wheel from stop to stop.
You have just attempted to simulate the condition that initially set the trouble code message.
Did the DTC become active?
  1. Yes : Select appropriate symptom from Symptom List.
  2. No : No problem found at this time. Erase all codes before returning vehicle to customer.
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11
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.
  1. Repair: Replace the Airbag Control Module in accordance with Service Instructions.
  2. Perform AIRBAG VERIFICATION TEST .
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