Ignition Mux Switch Input Open - Chrysler Town and Country 2003 Owner's Manual

IGNITION, POWER, ACCESSORY
Symptom:

IGNITION MUX SWITCH INPUT OPEN

When Monitored and Set Condition:
IGNITION MUX SWITCH INPUT OPEN
When Monitored: With the ignition on and battery voltage greater than 10.4 volts.
Set Condition: The Ignition MUX sense circuit voltage at the BCM goes above 4.9 volts.
IGNITION SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
IGNITION SWITCH FAILURE
IGNITION SWITCH SENSE RETURN CIRCUIT OPEN
BODY CONTROL MODULE
IGNITION SWITCH SENSE CIRCUIT OPEN
BODY CONTROL MODULE
TEST
1 Turn the ignition off.
Disconnect the Ignition Switch 5-way connector.
Turn the ignition on.
Measure the voltage of the Ignition Switch Sense circuit.
Is the voltage above 5.5 volts?
Yes → Repair the Ignition Switch Sense circuit for a short to voltage.
→ Go To 2
No
2 Turn the ignition off.
Disconnect the Ignition Switch 5-way connector.
Connect a jumper wire between the Ignition Switch Sense circuit and ground.
With the DRBIII in Sensors, read the IGNITION SW voltage.
Does the DRBIII display IGNITION SW 0.0 volts?
Yes → Go To 3
→ Go To 5
No
3 Turn the ignition off.
Disconnect the Ignition Switch 5-way connector.
Connect a jumper wire between the Ignition Switch Sense circuit and the Ignition
Switch Sense Return circuit.
With the DRBIII in Sensors, read the IGNITION SW voltage.
Does the DRBIII display IGNITION SW 0.0 volts?
Yes → Replace the Ignition Switch in accordance with the service infor-
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
mation.
Perform BODY VERIFICATION TEST - VER 1.
604
APPLICABILITY
All
All
All