Dodge Ram. Manual — part 90
Symptom:
MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
HEADLAMP SWITCH
HEADLAMP SWITCH MUX CIRCUIT OPEN
INSTRUMENT CLUSTER
HEADLAMP SWITCH SENSE CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all MIC DTC’s.
Turn the Headlamps on.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Headlamp Switch Input Circuit Open?
All
Yes
→ Go To 2
No
→ The condition that caused the symptom is currently not present.
Inspect the related wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2
Disconnect the Headlamp Switch connector.
Turn the ignition on.
Connect a jumper between the Headlamp Switch MUX and Sense circuit of the
multifunction switch.
With the DRBIII
t, read the headlamp switch voltage.
Does the DRBIII
t display 0.0 volts?
All
Yes
→ Replace the Headlamp Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the left side multifunction switch connector.
Disconnect the instrument cluster C2 connector.
Measure the resistance of the Headlamp Switch MUX circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Headlamp Switch MUX circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
357
EXTERIOR LIGHTING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off
Disconnect the left side Multifunction Switch connector.
Disconnect the Instrument Cluster C2 connector.
Measure the resistance of the Headlamp Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Headlamp Switch Sense circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
358
EXTERIOR LIGHTING
MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN —
Continued
Symptom:
MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED
POSSIBLE CAUSES
INTERMITTENT CONDITION
HEADLAMP SWITCH
HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all MIC DTC’s.
Turn the Headlamps on.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Headlamp Switch Input Circuit Short?
All
Yes
→ Go To 2
No
→ The condition that caused the symptom is currently not present.
Inspect the related wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2
Disconnect the Headlamp Switch connector.
Turn the ignition on.
Does the DRBIII
t display Headlamp Switch 5.0 volts?
All
Yes
→ Go To 3
No
→ Replace the Headlamp Switch.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Headlamp Switch connector.
Disconnect the instrument cluster C3 connector.
Measure the resistance of the Headlamp Switch MUX circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Headlamp Switch MUX circuit for a short to ground
condition.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
359
EXTERIOR LIGHTING
Symptom:
MIC-TURN HAZARD SWITCH INPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
MULTIFUNCTION SWITCH
WIPER/TURN/BEAM SELECT SWITCH SENSE
INSTRUMENT CLUSTER
TURN LAMPS SWITCH FEED CIRCUIT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all MIC DTC’s.
Actuate the Hazard Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Turn Hazard Switch Input Circuit Open?
All
Yes
→ Go To 2
No
→ The condition that caused the symptom is currently not present.
Inspect the related wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2
Disconnect the Multifunction Switch connector.
Turn the ignition on.
Measure the voltage of the Multifunction Switch between the Sense circuit and the
Feed circuit.
Does the voltage read 0.0volts?
All
Yes
→ Replace the Multifunction Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Multifunction Switch connector.
Disconnect the Instrument Cluster C3 connector.
Measure the resistance of the Wipe/Turn/Beam select sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Wiper/Turn/Beam Select Switch Sense circuit.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off
Disconnect the Multifunction Switch connector.
Disconnect the Instrument Cluster C2 connector.
Measure the resistance of the Turn Lamps Switch Feed circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Turn Lamps Switch Feed circuit.
Perform BODY VERIFICATION TEST - VER 1.
360
EXTERIOR LIGHTING
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