Chrysler Pacifica. Manual — part 171
Symptom:
IGNITION MUX SWITCH INPUT OPEN - BCM
When Monitored and Set Condition:
IGNITION MUX SWITCH INPUT OPEN - BCM
When Monitored:
When the BCM detects battery voltage on Ignition Run/Start input.
Set Condition:
The BCM detects the Ignition MUX Switch Input voltage is greater than
4.78 volts for 2 seconds.
POSSIBLE CAUSES
IGNITION SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
IGNITION SWITCH SENSE CIRCUIT OPEN
IGNITION SWITCH SENSE RETURN CIRCUIT OPEN
IGNITION SWITCH
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Disconnect the BCM C5 harness connector.
Measure the voltage between the Ignition Switch Sense circuit and ground.
Is there any voltage present?
All
Yes
→ Repair the Ignition Switch Sense circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Connect a jumper wire between Ignition Switch Sense circuit and ground.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display 9Ignition MUX Switch Input Short9?
All
Yes
→ Go To 3
No
→ Repair the Ignition Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display 9Ignition MUX Switch Input Short9?
All
Yes
→ Replace the Ignition Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Ignition Switch Sense Return circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
681
IGNITION, POWER, ACCESSORY
Symptom:
IGNITION MUX SWITCH INPUT SHORT - BCM
When Monitored and Set Condition:
IGNITION MUX SWITCH INPUT SHORT - BCM
When Monitored:
When the BCM detects battery voltage on the Ignition Run/Start input.
Set Condition:
The BCM detects the Ignition MUX Switch Input voltage is less than 0.27
volts for 10 seconds.
POSSIBLE CAUSES
IGNITION SWITCH SENSE CIRCUIT SHORT TO IGNITION SWITCH SENSE RETURN CIRCUIT
IGNITION SWITCH SENSE CIRCUIT SHORT TO GROUND
IGNITION SWITCH
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Disconnect the BCM C4 and C5 harness connectors.
Measure the resistance of the between the Ignition Switch Sense circuit and the
Ignition Switch Sense Return circuit.
Is the resistance below 100 ohms?
All
Yes
→ Repair the Ignition Switch Sense circuit for a short to the Ignition
Switch Sense Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Disconnect the BCM C5 harness connector.
Measure the resistance between ground and the Ignition Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Ignition Switch Sense circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Ignition Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
682
IGNITION, POWER, ACCESSORY
Symptom:
IGNITION RUN/START INPUT MISMATCH - IPM
When Monitored and Set Condition:
IGNITION RUN/START INPUT MISMATCH - IPM
When Monitored:
When the IPM is powered up.
Set Condition:
IPM internal sense detects the hardwire Ign Run Switch in I/O’s =
9OFF9
(no voltage), and the Ignition State in Monitors =
9Start9 (BCM Ignition Switch MUX-based
PCI bus data) for 5 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUSED B(+) CIRCUIT SHORT TO GROUND
FUSED B(+) CIRCUIT OPEN
IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT SHORT TO GROUND
IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN
IGNITION SWITCH
SKREEM
BCM
IPM
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the battery is fully charged and battery cables are properly
tightened.
NOTE: Ensure the IPM battery and ground connections are clean and
properly tightened.
Using the wiring diagram/schematic as a guide, measure the voltage between ground
and the B(+) circuit to Fuse #30.
Is the voltage above 10.5 volts?
All
Yes
→ Go To 2
No
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove and inspect IPM Fuse #30.
NOTE: If fuse is open, replace with proper rated fuse. Turn the ignition to
the
(RUN( position only.
Turn the ignition off.
Remove and inspect IPM Fuse #30.
Is the IPM Fuse #30 open?
All
Yes
→ Go To 3
No
→ Go To 10
683
IGNITION, POWER, ACCESSORY
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the IPM C9 harness connector.
Measure the resistance between ground and the IPM C9, terminal pin 2.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the IPM C9 harness connector.
Disconnect the Ignition Switch harness connector.
Measure the resistance between ground and the Fused B(+) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Fused B(+) circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Measure the resistance of the Ignition Switch terminal pin 3 to ground.
Measure the resistance of the Ignition Switch terminal pin 5 to ground.
Is the resistance below 5.0 ohms for either terminal pin?
All
Yes
→ Replace the Ignition Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the IPM C9 harness connector.
Disconnect the BCM C2 harness connector.
Disconnect the Ignition Switch harness connector.
Disconnect the SKREEM harness connector.
Using the wiring diagram/schematic as a guide, measure the resistance between
ground and the Ignition Switch Output (Run-Start) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Ignition Switch Output (Run-Start) circuit for a short
to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the IPM C9 harness connector.
Remove the Fuel Pump relay from the IPM.
Measure the resistance between ground and the IPM C9, terminal pin 13.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 8
684
IGNITION, POWER, ACCESSORY
IGNITION RUN/START INPUT MISMATCH - IPM —
Continued
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