Dodge Ram. Manual — part 121
Symptom:
RKE FOB BATTERY LOW
When Monitored and Set Condition:
RKE FOB BATTERY LOW
When Monitored:
Upon activation of any button on the Remote Keyless Entry transmit-
ter (fob).
Set Condition:
The RKE module monitors the input from the fobs and determines if the
voltage is within tolerance. If the battery voltage of the RKE fob falls between 2.0 and 3.5
volts the RKE module will communicates this to the Instrument Cluster which in turn will
set this code.
POSSIBLE CAUSES
BATTERIES LOW
CODE ACTIVE
TRANSMITTER - LOW VOLTAGE OUTPUT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Using the RKE transmitter, press the UNLOCK button six times or more.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display RKE KEY FOB BATTERY LOW?
All
Yes
→ Go To 2
No
→ Problem is intermittent and not present at this time. Check the
other transmitters used with this vehicle to determine which one
set the code. Check the voltage of each battery in FOB and ensure
they above 2.9 volts each.
Perform BODY VERIFICATION TEST - VER 1.
2
Test the voltage of each battery in the RKE transmitter..
Is the voltage at or above 2.9 in each battery?
All
Yes
→ Replace the RKE Transmitter.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the batteries and press the unlock button on the trans-
mitter six times to clear the DTC..
Perform BODY VERIFICATION TEST - VER 1.
481
POWER DOOR LOCKS/RKE
Symptom:
RKE MODULE COMMUNICATION LINK
When Monitored and Set Condition:
RKE MODULE COMMUNICATION LINK
When Monitored:
Whenever battery power is applied the Instrument Cluster.
Set Condition:
The Instrument Cluster has learned that the vehicle is equipped with
Remote Keyless Entry, but then is unable to communicate with that module, this code will
set. The Instrument Cluster provides power for the RKE module and communicates by the
PCI bus.
POSSIBLE CAUSES
DTC PRESENT
INSTRUMENT CLUSTER - OPEN LINK
RKE MODULE OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, record and erase DTC’s.
With the DRBIII
t, read DTC’s.
Operate the door locks several times from the RKE transmitter while observing the
DRBIII
t.
Does the DRBIII
t display RKE MODULE COMM LINK?
All
Yes
→ Go To 2
No
→ Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove the Instrument Cluster.
Replace the RKE module with a known good module.
With the DRBIII
t, Program the RKE transmitter.
Operate the door locks using the RKE transmitter.
Do the door locks respond correctly with the RKE transmitter?
All
Yes
→ Replace the original RKE module.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
482
POWER DOOR LOCKS/RKE
Symptom:
*ALL DOOR LOCKS INOPERATIVE
POSSIBLE CAUSES
DTC PRESENT
FUSE #22 OPEN
FUSE B+ CIRCUIT OPEN
INSTRUMENT CLUSTER - OPEN CIRCUIT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Does the DRBIII
t display any Door Lock related DTC’s?
All
Yes
→ Refer to symptom list for problems related to Power Door Locks.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Test both sides of fuse #22 in the PDC.
Is there 12 volts on both sides of fuse #22?
All
Yes
→ Go To 3
No
→ Replace the fuse if open and retry the system. If the fuse blows,
locate and repair a short to the Instrument Cluster. The 12 volt
supply to the fuse is a bus bar in the PDC.
Perform BODY VERIFICATION TEST - VER 1.
3
Remove the instrument cluster.
Measure the voltage between the Fused B+ circuit and ground (cavity 2 in the C1
connector to ground).
Is the voltage above 10.0 volts on the Fused B+ circuit?
All
Yes
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Fused B+ circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
483
POWER DOOR LOCKS/RKE
Symptom:
*AUTO (ROLLING) DOOR LOCKS INOPERATIVE
POSSIBLE CAUSES
CHECK THE DOOR AJAR SWITCH STATUS
WITH THE DRB CHECK FOR PCM DTC’S
WITH THE DRB ENABLE AUTO DOOR LOCKS
INSTRUMENT CLUSTER - AUTO DOOR LOCKS FAIL
TEST
ACTION
APPLICABILITY
1
Ensure all doors are closed.
With the DRBIII, enter
9Electro/Mech Cluster9 then 9Input/Output9 and observe all of
the Door Ajar states.
Does the DRBIII display CLOSED for any door ajar state?
All
Yes
→ Refer to symptom for the appropriate DOOR AJAR CIRCUIT
SHORTED in the DOOR AJAR category.
No
→ Go To 2
2
With the DRBIII read
9Engine9 DTC’s.
Does the DRBIII display any TPS or VSS related DTC’s?
All
Yes
→ Refer to symptom list for problems related to DRIVEABILITY.
No
→ Go To 3
3
With the DRBIII, enter
9Electron/Mech Cluster9 then 9Miscellaneous9 and observe
the rolling door lock status.
Does the DRBIII display ROLLING DOOR LOCKS: ENABLED
All
Yes
→ Go To 4
No
→ With the DRBIII, enable the Auto Door Locks.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
484
POWER DOOR LOCKS/RKE
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