LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2004 >> Wrangler Rubicon, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures >> Diagnostic Information And Procedures >> Electrically Heated System >> Symptom: *REAR WINDOW DEFOGGER INOPERATIVE >> Diagnostic Procedure

Diagnostic Procedure

REAR WINDOW DEFOGGER INOPERATIVE - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1 Toggle the Rear Defogger switch and listen to the Rear Window Defogger Relay in the PDC.
Does the relay click when the switch is pressed?
  1. Yes : Go To 2
  2. No : Go To 6
 All
2 Turn the ignition off.
Open the tailgate.
Measure resistance between ground and the Rear Window Defogger Ground circuit.
Is the resistance below 5.0 ohms?
  1. Yes : Go To 3
  2. No : Repair the Rear Window Defogger Ground Circuit for an open condition.

    Perform BODY VERIFICATION TEST .

 All
3 Turn the ignition on.
Turn the Rear Window Defogger on.
Using a 12-volt test light connected to ground, check the Rear Window Defogger Relay Output circuit at the defogger grid.
Does the test light illuminate brightly?
  1. Yes : Repair the open in the Rear Window Defogger Grid.

    Perform BODY VERIFICATION TEST .

  2. No : Go To 4
 All
4 Remove the Rear Window Defogger Relay.
Turn the ignition on.
Measure voltage of the Fused B+ Circuit in the Rear Window Defogger Relay-connector.
Is the voltage above 10.0 volts?
  1. Yes : Go To 5
  2. No : Repair the open Fused B+ Circuit from PDC fuse #2.

    Perform BODY VERIFICATION TEST .

 All
5 Remove the Rear Window Defogger Relay.
Install a known good relay in the Rear Window Defogger Relay connector.
Turn the ignition on.
Check the Rear Window Defogger for proper operation.
Does the system operate normally?
  1. Yes : Replace the original Rear Window Defogger Relay.

    Perform BODY VERIFICATION TEST .

  2. No : Repair the Rear Window Defogger Relay Output Circuit for an open condition.

    Perform BODY VERIFICATION TEST .

 All
6 Remove the Rear Window Defogger Relay from the PDC.
Turn the ignition switch On.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output circuit at the relay.
Does the test light illuminate brightly?
  1. Yes : Go To 7
  2. No : Repair the open Fused Ignition Switch Output circuit from PDC fuse #7

    Perform BODY VERIFICATION TEST .

 All
7 Install a known good relay in the Rear Window Defogger Relay.
Turn the ignition on.
Check the Rear Window Defogger for proper operation.
Does the system operate normally?
  1. Yes : Replace the original Rear Window Defogger Relay.

    Perform BODY VERIFICATION TEST .

  2. No : Go To 8
 All
8 Turn the ignition off.
Remove the Rear Window Defogger Relay from the PDC.
Disconnect the Instrument Cluster C2 connector.
Measure the resistance of the Rear Window Defogger Relay Control circuit between the Instrument Cluster C2 connector and the PDC.
Is the resistance below 5.0 ohms?
  1. Yes : Go To 9
  2. No : Repair the Rear Window Defogger Relay Control Circuit for an open.

    Perform BODY VERIFICATION TEST .

 All
9 Turn the ignition off.
Disconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch connector.
Turn the ignition on.
Measure voltage between the Rear Window Defogger Switch Sense Circuit and ground.
Is any voltage present?
  1. Yes : Repair the Rear Window Switch Sense Circuit for a short to voltage condition.

    Perform BODY VERIFICATION TEST .

  2. No : Go To 10
 All
10 Turn the ignition off.
Disconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch connector.
Measure resistance between ground and the Rear Window Defogger Switch Sense Circuit.
Is the resistance below 5.0 ohms?
  1. Yes : Repair the Rear Window Defogger Switch Sense Circuit for a short to ground condition.

    Perform BODY VERIFICATION TEST .

  2. No : Go To 11
 All
11 Turn the ignition off.
Disconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch.
Measure resistance of the Rear Window Defogger Switch Sense circuit from the Instrument Cluster C2 connector to the Defogger switch connector.
Is the resistance below 5.0 ohms?
  1. Yes : Go To 12
  2. No : Repair the Rear Window Defogger Switch Sense Circuit for an open condition.

    Perform BODY VERIFICATION TEST .

 All
12 Turn the ignition off.
Reinstall the Rear Window Defogger Relay.
Reconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch connector.
Turn the ignition on.
Connect a jumper wire between the Rear Window Defogger Switch Sense circuit in the Defogger Switch connector to ground and listen for the relay to click.
Does the Defogger Relay click?
  1. Yes : Replace the Rear Window Defogger Switch.

    Perform BODY VERIFICATION TEST .

  2. No : Replace the Instrument Cluster.

    Perform BODY VERIFICATION TEST .

 All
scientia non olet · About LEMON Manuals