Chrysler Concorde 2004 Service Manual page 265

Symptom:
A/C CONTROL MODE DOOR INPUT OPEN OR SHORTED TO BAT-
TERY (MANUAL A/C)
When Monitored and Set Condition:
A/C CONTROL MODE DOOR INPUT OPEN OR SHORTED TO BATTERY (MAN-
UAL A/C)
When Monitored: With the ignition on.
Set Condition: The BCM detects an abnormally high voltage on its mode request input.
MODE SWITCH MUX CIRCUIT SHORTED TO BATTERY
MODE SWITCH MUX CIRCUIT OPEN
CONTROL HEAD - MODE MUX OPEN
BODY CONTROL MODULE - MODE SWITCH MUX OPEN
TEST
1 With the DRBIII , erase Body Controller DTC's.
Turn the ignition off.
Disconnect the Manual Temp Control Head C1 harness connector.
Disconnect the Body Control Module C2 harness connector.
Turn the ignition on.
Measure the voltage of the Mode Switch MUX circuit.
Is there any voltage present?
Yes → Repair the Mode Switch MUX circuit for a short to voltage.
→ Go To 2
No
2 Turn the ignition off.
Disconnect the Manual Temp Control Head C1 harness connector.
Disconnect the Body Control Module C2 harness connector.
Measure the resistance of the Mode Switch MUX circuit between the Manual Temp
Control Head C1 connector and the BCM C2 connector.
Is the resistance below 5.0 ohms?
Yes → Go To 3
→ Repair the Mode Switch MUX circuit for an open.
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
249
HEATING & A/C
APPLICABILITY
All
All