Chrysler Town, Dodge Caravan. Manual — part 800
Symptom:
EBL RUN ONLY RELAY OPEN
When Monitored and Set Condition:
EBL RUN ONLY RELAY OPEN
When Monitored:
Continuously with the ignition on.
Set Condition:
The FCM has detected an open in the Rear Defogger Relay control circuit.
POSSIBLE CAUSES
OPEN B+ TO RELAY
VERIFY ACTIVE DTC
MISSING RELAY
FRONT CONTROL MODULE
REAR WINDOW DEFOGGER RELAY
INTELLIGENT POWER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase the current Front Control Module DTC’s.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DRBIII
t display EBL RUN ONLY RELAY OPEN trouble code?
All
Yes
→ Go To 2
No
→ The condition that caused this symptom is currently not present
at this time.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Check the IPM to make certain the Rear Window Defogger Relay is present.
Is the Rear Window Defogger Relay present?
All
Yes
→ Go To 3
No
→ Replace the missing Rear Defogger Relay.
Perform BODY VERIFICATION TEST - VER 1.
3
Remove the Rear Window Defogger relay from the IPM.
Measure the voltage of pin 86 in the Rear Defogger Relay socket.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 4
No
→ Repair/replace open B+ to relay as necessary.
Perform BODY VERIFICATION TEST - VER 1.
436
ELECTRICALLY HEATED SYSTEMS
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Install a known good relay in place of the Rear Window Defogger relay.
Turn the ignition on.
Attempt to operate the Rear Window Defogger.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DTC reset?
All
Yes
→ Go To 5
No
→ Replace the Rear Defogger Relay.
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the Front Control Module from the Fuse and Relay Center.
Remove the Rear Window Defogger Relay.
Measure the resistance of the Rear Window Defogger Relay Control Circuit in the
Fuse and Relay Center.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Fuse and Relay Center.
Perform BODY VERIFICATION TEST - VER 1.
437
ELECTRICALLY HEATED SYSTEMS
EBL RUN ONLY RELAY OPEN —
Continued
Symptom:
EBL RUN ONLY RELAY SHORTED TO BATTERY
When Monitored and Set Condition:
EBL RUN ONLY RELAY SHORTED TO BATTERY
When Monitored:
Continuously with the ignition on.
Set Condition:
The FCM has detected a short to battery voltage in the Rear Defogger
Relay control circuit.
POSSIBLE CAUSES
VERIFY ACTIVE DTC
FRONT CONTROL MODULE
INTELLIGENT POWER MODULE
REAR WINDOW DEFOGGER RELAY
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase the current Front Control Module DTC’s.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIII
t, read the current Front Control Module DTC’s.
Does the DRBIII
t display EBL RUN ONLY RELAY SHORTED TO BATTERY
trouble code?
All
Yes
→ Go To 2
No
→ The condition that caused this symptom is currently not present
at this time.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Install a known good relay in place of the Rear Window Defogger relay.
Turn the ignition on.
Attempt to operate the Rear Window Defogger.
With the DRBIII
t, read the current Front Control Module DTCs.
Did the DTC reset?
All
Yes
→ Go To 3
No
→ Replace the Rear Defogger Relay.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Remove the Rear Window Defogger Relay from the IPM.
Remove the Front Control Module from the IPM.
Measure the voltage of the Rear Window Relay Control circuit.
Is the voltage above 1.0 volts?
All
Yes
→ Replace the Fuse and Relay Center.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
438
ELECTRICALLY HEATED SYSTEMS
Symptom:
BACKUP LAMP OUTPUT OPEN
When Monitored and Set Condition:
BACKUP LAMP OUTPUT OPEN
When Monitored:
Trans in reverse.
Set Condition:
Voltage output status is Low.
POSSIBLE CAUSES
INTERMITTENT CONDITION
GROUND CIRCUIT
BACKUP LAMP OPEN
BACKUP LAMP DRIVER CIRCUIT OPEN
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all BCM, IPM DTC’s.
Actuate the Backup Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Backup Lamp Output 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 terminal push out or any chafed, pierced, pinched, or
partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off
Disconnect the inoperative rear tail lamp harness connector.
Using a 12-volt test light connected to 12-volts, check the ground circuit.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Repair the Ground Circuit.
Perform BODY VERIFICATION TEST - VER 1.
439
EXTERIOR LIGHTING
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