Dodge Ram. Manual — part 85
Symptom:
FCM-LEFT STOP LAMP OUTPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
LEFT BRAKE LAMP FEED CIRCUIT OPEN
FRONT CONTROL MODULE
POWER DISTRIBUTION CENTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all FCM DTC’s.
Actuate the Stop Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Left Stop Lamp Output 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
Turn the ignition off.
Disconnect the IPM C3 harness connector
Measure the resistance of the Left Brake Lamp Feed circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Left Brake Lamp Feed circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off
Disconnect the FCM from the IPM.
Disconnect the IPM C3 harness connector.
Measure the resistance of the Left Brake Lamp Feed circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Replace the Power Distribution Center..
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
337
EXTERIOR LIGHTING
Symptom:
FCM-LEFT TRAIL RELAY OUTPUT CIRCUIT HIGH
POSSIBLE CAUSES
INTERMITTENT CONDITION
FRONT CONTROL MODULE
INTEGRATED POWER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Left Trailer Relay Output Circuit High?
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
Turn the ignition off.
Remove the Front Control Module from the IPM.
Measure the voltage of the Trailer Tow Relay Control circuit and ground.
Is the voltage above 1.0 volts?
All
Yes
→ Replace the Integrated Power Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
338
EXTERIOR LIGHTING
Symptom:
FCM-LEFT TRAIL RELAY OUTPUT CIRCUIT LOW
POSSIBLE CAUSES
INTERMITTENT CONDITION
FRONT CONTROL MODULE
POWER DISTRIBUTION CENTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Left Trailer Relay Output Circuit Low?
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
Turn the ignition off
Remove the FCM from the IPM.
Measure the resistance between ground and the Trailer Tow Relay control circuit in
the IPM.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Power Distribution Center(PDC).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
339
EXTERIOR LIGHTING
Symptom:
FCM-LEFT TRAIL RELAY OUTPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
INTEGRATED POWER MODULE
FRONT CONTROL MODULE
TRAILER RELAY OUTPUT CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Left Trailer Relay Output 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
Turn the ignition off.
Check the IPM to make certain the Left Trailer Tow Relay is present.
Is the Trailer Tow Relay present?
All
Yes
→ Go To 3
No
→ Replace the Integrated Power Module.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off
Measure the voltage of the Fused B+ circuit of the Trailer Tow Relay in the IPM.
Is the voltage above 10 volts?
All
Yes
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Trailer Lamp Relay Output Circuit.
Perform BODY VERIFICATION TEST - VER 1.
340
EXTERIOR LIGHTING
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