Chrysler Pacifica. Manual — part 115
Symptom:
HEADLAMP SWITCH INPUT OPEN-BCM
POSSIBLE CAUSES
HEADLAMP SWITCH MUX CIRCUIT OPEN
HEADLAMP SWITCH MUX RETURN CIRCUIT OPEN
HEADLAMP SWITCH OPEN
INTERMITTENT WIRING AND CONNECTORS
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all BCM DTC’s.
Turn the headlamps to the ON position.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display HEADLAMP SWITCH INPUT OPEN?
All
Yes
→ Go To 2
No
→ Go To 5
2
Turn the ignition off.
Disconnect the Headlamp Switch harness connector.
Connect a jumper wire between the Headlamp Switch MUX circuit and the
Headlamp Switch MUX Return circuit in the Headlamp Switch harness connector.
Turn the ignition on.
With the DRBIII
t, select Body, Body Controller and read the Headlamp Switch volts.
Does the DRBIII
t Headlamp Switch Sensor voltage read less than 0.5 Volts?
All
Yes
→ Replace the Headlamp Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off to the lock position.
Disconnect the Body Control Module C5 harness connector.
Disconnect the Headlamp Switch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the Headlamp Switch MUX circuit from the Body Control
Module connector to the Headlamp Switch harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Headlamp Switch MUX circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
457
EXTERIOR LIGHTING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off to the lock position.
Disconnect the Body Control Module C5 harness connector.
Disconnect the Headlamp Switch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the Headlamp Switch MUX Return circuit from the Body
Control Module connector to the Headlamp Switch harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Headlamp Switch MUX Return circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
5
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
458
EXTERIOR LIGHTING
HEADLAMP SWITCH INPUT OPEN-BCM —
Continued
Symptom:
HEADLAMP SWITCH INPUT SHORT-BCM
POSSIBLE CAUSES
HEADLAMP SWITCH SHORTED
HEADLAMP SWITCH MUX CIRCUIT SHORT TO MUX RETURN CIRCUIT
HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND
INTERMITTENT WIRING AND CONNECTORS
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all BCM DTC’s.
Turn the headlamps to the ON position.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display HEADLAMP SWITCH INPUT SHORT?
All
Yes
→ Go To 2
No
→ Go To 5
2
Turn the ignition off.
Disconnect the Headlamp Switch harness connector.
Turn the ignition on.
With the DRBIII
t, select Body, Body Control Module and read the Headlamp Switch
voltage..
Does the DRB display a Headlamp Switch Voltage of more than 4.8 volts?
All
Yes
→ Replace the Headlamp Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off to the lock position.
Disconnect the Body Control Module C5 harness connector.
Disconnect the Headlamp Switch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the Headlamp Switch MUX Return circuit and the
Headlamp Switch MUX circuit.
Is the resistance less than 5.0 ohms?
All
Yes
→ Repair the Headlamp Switch MUX circuit for a short to the
Headlamp Switch MUX Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
459
EXTERIOR LIGHTING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off to the lock position.
Disconnect the Body Control Module C5 harness connector.
Disconnect the Headlamp Switch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Headlamp Switch MUX circuit.
Is the resistance less than 5.0 ohms?
All
Yes
→ Repair the Headlamp Switch MUX Circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
5
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
460
EXTERIOR LIGHTING
HEADLAMP SWITCH INPUT SHORT-BCM —
Continued
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