Dodge Ram. Manual — part 105
Symptom:
BATTERY VOLTAGE OPEN
POSSIBLE CAUSES
OPEN B+ CIRCUIT
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: This DTC must be active to perform this test. If DTC is stored, erase
DTC and check for an intermittent condition.
Turn the ignition off.
Remove the Front Control Module from the IPM.
Using a 12-volt test light connected to ground, probe the B+ circuit (cav 10).
Is the test light illuminated?
All
Yes
→ Replace the Front Control Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Power Distribution Center (PDC) in accordance with
the service information.
Perform BODY VERIFICATION TEST - VER 1.
417
IGNITION, POWER, ACCESSORY
Symptom:
HORN RELAY CONTROL CIRCUIT HIGH
When Monitored and Set Condition:
HORN RELAY CONTROL CIRCUIT HIGH
When Monitored:
With the ignition ON.
Set Condition:
When the Front Control Module detects excessive current on the Horn
Relay Control circuit.
POSSIBLE CAUSES
FRONT CONTROL MODULE
INTEGRATED POWER MODULE
INTERMITTENT DTC
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, record and erase FCM DTC’s.
With the DRBIII
t, actuate the Horn Relay.
With the DRBIII
t, read FCM DTC’s.
Does the DRBIII
t display a HORN RELAY CONTROL CIRCUIT DTC active?
All
Yes
→ Go To 2
No
→ Go To 3
2
Turn the ignition off.
Remove the Front Control Module from the Integrated Power Module.
NOTE: Check connectors - Clean/repair as necessary.
Use a fused jumper wire for the next step.
Momentarily jumper the Horn Relay Control circuit to ground at the FCM connector.
Does the Horn sound?
All
Yes
→ Replace the Front Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Integrated Power Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Visually inspect the related circuit connectors. Look for broken, bent, pushed out, or
corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→ Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
418
IGNITION, POWER, ACCESSORY
Symptom List:
HORN RELAY CONTROL CIRCUIT LOW
HORN RELAY CONTROL CIRCUIT OPEN
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be HORN RELAY CONTROL CIR-
CUIT LOW.
When Monitored and Set Condition:
HORN RELAY CONTROL CIRCUIT LOW
When Monitored:
With the ignition ON.
Set Condition:
When the Front Control Module detects a short on the Horn Relay Control
circuit.
HORN RELAY CONTROL CIRCUIT OPEN
When Monitored:
With the ignition ON.
Set Condition:
When the Front Control Module detects an open on the Horn Relay
Control circuit.
POSSIBLE CAUSES
FRONT CONTROL MODULE
FUSE #45
INTEGRATED POWER MODULE
INTERMITTENT DTC
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, record and erase FCM DTC’s.
With the DRBIII
t, read FCM DTC’s.
Does the DRBIII
t display a HORN RELAY CONTROL CIRCUIT DTC active?
All
Yes
→ Go To 2
No
→ Go To 4
2
Turn the ignition off.
Check fuse #45 in the IPM.
Is the fuse open?
All
Yes
→ Replace the fuse. Check for a short to ground in the Horn Relay
Output circuit from the IPM to the horns.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
419
IGNITION, POWER, ACCESSORY
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Reinstall the fuse if previously removed.
Remove the Front Control Module from the Integrated Power Module.
NOTE: Check connectors - Clean/repair as necessary.
Measure the voltage of the Horn Relay Control circuit.
Is the voltage above 11.0 volts?
All
Yes
→ Replace the Front Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Integrated Power Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Visually inspect the related circuit connectors. Look for broken, bent, pushed out, or
corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→ Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
420
IGNITION, POWER, ACCESSORY
HORN RELAY CONTROL CIRCUIT LOW —
Continued
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