Atc Head Illumination Inoperative - Chrysler Concorde 2004 Service Manual

HEATING & A/C
Symptom:

*ATC HEAD ILLUMINATION INOPERATIVE

IDENTIFY ATC HEAD ILLUMINATION PROBLEM
GROUND CIRCUIT OPEN
PANEL LAMPS FEED CIRCUIT OPEN
ATC HEAD - ILLUMINATION INOPERATIVE
TEST
1 Turn the park lamps on and observe the ATC Head display.
Is the problem with the letters and LED lights?
Yes → Replace the Automatic Temperature Control Head.
→ Go To 2
No
2 Turn the ignition off.
Disconnect the ATC Head harness connector.
Turn off all lights.
Measure the resistance between ground and the Ground circuit (cavity 3).
Is the resistance below 5.0 ohms?
Yes → Go To 3
→ Repair the Ground circuit for an open.
No
3 Note: This path repairs the background lights.
Disconnect the ATC Head harness connector.
Turn the park lamps on.
Measure the voltage of the Panel Lamps Feed circuit.
Rotate the Dimmer Switch Thumb Wheel and observe the voltage.
Does the voltage range from below 3.5 volts to above 9.0 volts when the switch is
rotated?
Yes → Go To 4
→ Repair the Panel Lamps Feed circuit for an open.
No
4 If there are no possible causes remaining, view repair.
Repair
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
Replace the Automatic Temperature Control Head.
Perform BODY VERIFICATION TEST - VER 1.
330
APPLICABILITY
All
All
All
All