Dodge Ram Truck 1500-2500-3500. Manual — part 405

MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN (CONTINUED)

3.

HEADLAMP SWITCH MUX CIRCUIT OPEN

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?

Yes

>> Go To 4

No

>> Repair the Headlamp Switch MUX circuit for an open con-

dition.

Perform BODY VERIFICATION TEST - VER 1.

4.

INSTRUMENT CLUSTER

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?

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.

8L - 26

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED

DR/DH

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

8L - 27

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR -
SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on

•

Set Condition:
The CCN detects a short to ground condition

Possible Causes

HEADLAMP SWITCH

HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND

INSTRUMENT CLUSTER

1.

INTERMITTENT CONDITION

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?

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.

HEADLAMP SWITCH

Disconnect the Headlamp Switch connector.

Turn the ignition on.

Does the DRBIII

T

display Headlamp Switch 5.0 volts?

Yes

>> Go To 3

No

>> Replace the Headlamp Switch.

Perform BODY VERIFICATION TEST - VER 1.

8L - 28

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED (CONTINUED)

3.

HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND

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?

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.

DR/DH

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

8L - 29