Chrysler 300M 2002 Service Manual page 1938

Symptom:
*REAR WINDOW DEFOGGER INOPERATIVE WITH ATC
REAR DEFOG OPERATES OK
DEFOGGER GRID GROUND CIRCUIT OPEN
REAR WINDOW DEFOGGER GRID OPEN
REAR WINDOW DEFOGGER RELAY-OPEN
REAR DEFOGGER RELAY OUTPUT CKT OPEN
REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT OPEN
REAR WINDOW DEFOGGER RELAY OUTPUT SHORT TO GROUND
FUSED B+ CIRCUIT OPEN
FUSED B+ SHORT TO GROUND
BODY CONTROL MODULE - REAR DEFOGGER RELAY CONTROL OPEN
ATC HEAD-REAR DEFOG SWITCH
TEST
1 Turn the ignition on.
With the DRBIII in Inputs Outputs read the EBL SW state.
Push and hold the Rear Window Defogger switch on and off and observe the DRB.
Does the DRBIII display EBL SW Open Closed?
Yes → Go To 2
→ Replace the Automatic Temperature Control Head.
No
2 Measure the resistance of the Defogger Grid ground circuit from the left end of the
glass grid to ground..
Is the resistance below 5.0 ohms?
Yes → Go To 3
→ Repair the open Ground circuit.
No
3 Turn the ignition on.
Press the Rear Window Defogger Switch On.
Using a 12-volt Test Light connected to ground, probe the Rear Defogger Relay
Output circuit at the right side of the grid.
Did the test light illuminate?
Yes → Repair the open Rear Window Defogger Grid.
→ Go To 4
No
ELECTRICALLY HEATED SYSTEMS
POSSIBLE CAUSES
ACTION
Perform MEMORY HEATED SYSTEM VERIFICATION TEST -
VER 1.
Perform MEMORY HEATED SYSTEM VERIFICATION TEST -
VER 1.
Perform MEMORY HEATED SYSTEM VERIFICATION TEST -
VER 1.
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APPLICABILITY
All
All
All