Dodge Ram. Manual — part 26
TEST
ACTION
APPLICABILITY
9
With the DRBIII
t, record and erase all DTC’s from all Airbag modules.
If equipped with Passenger Airbag On - Off switch, read the DTC’s in all switch
positions.
If any ACTIVE codes are present they must be resolved before diagnosing any stored
codes.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Look for chaffed, pierced, pinched, or partially broken wires and broken, bent, pushed
out, spread, corroded, or contaminated terminals.
The following additional checks may assist you in identifying a possible intermittent
problem.
Reconnect any disconnected components and harness connector.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION ON, THEN RECONNECT THE BATTERY.
With the DRBIII
t monitor active codes as you work through the following steps.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, MAINTAIN A SAFE
DISTANCE FROM ALL AIRBAGS WHILE PERFORMING THE FOLLOWING
STEPS.
Wiggle the wiring harness and connectors of the related airbag circuit or component.
If codes are related to the Driver Airbag circuits, rotate the steering wheel from stop
to stop.
IF only stored codes return continue the test until the problem area has been isolated
In the previous steps you have attempted to recreate the conditions responsible for
setting active DTC in question.
Are any ACTIVE DTCs present?
All
Yes
→ Select appropriate symptom from Symptom List.
No
→ No problem found at this time. Erase all codes before returning
vehicle to customer.
101
AIRBAG
NO LEFT SIDE IMPACT SENSOR 1 COMMUNICATION —
Continued
Symptom List:
NO PCI LOOPBACK
NO PCI TRANSMISSION
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be NO PCI LOOPBACK.
When Monitored and Set Condition:
NO PCI LOOPBACK
When Monitored:
With the ignition on and the module transmitting information on the
BUS.
Set Condition:
The code will set immediately if the onboard diagnostic cannot detect the
module transmitting information on the BUS. NOTE: Any Bus Failure will may cause a
stored code to set.
NO PCI TRANSMISSION
When Monitored:
With the ignition on and the module transmitting information on the
BUS.
Set Condition:
The code will set immediately if the onboard diagnostic cannot detect the
module transmitting information on the BUS. NOTE: Any Bus Failure will may cause a
stored code to set.
POSSIBLE CAUSES
WIRING HARNESS INTERMITTENT
OPEN PCI BUS CIRCUIT AT THE DATA LINK CONNECTOR (DLC)
PCI BUS CIRCUIT SHORTED TO VOLTAGE
MODULE SHORT TO VOLTAGE
PCI BUS CIRCUIT SHORTED TO GROUND
CHECKING FOR VOLTAGE AT ACM
GROUND CIRCUIT OPEN
PCI BUS CIRCUIT OPEN
AIRBAG CONTROL MODULE - ACM
ACM, NO RESPONSE FROM
102
AIRBAG
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Ensure the battery is fully charged.
NOTE: For the purpose of this test, the AECM and ORC modules will be
referred to as an ACM.
From the list below, select the appropriate module and DTC type for this diagnostic
trouble code.
DETERMINE ACTIVE OR STORED DTC
All
ACM - ACTIVE
Go To
2
ACM - STORED
Go To
3
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
2
WARNING: TO AVOID PERSONAL INJURY OR DEATH, DISCONNECT THE
BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY
TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Airbag Control Module in accordance with Service
Instructions.
Perform __AIRBAG VERIFICATION TEST - VER 1.
3
Note: Determine which modules this vehicle is equipped with before begin-
ning.
Note: When attempting to communicate with any of the modules on this
vehicle, the DRB will display 1 of 2 different communication errors: a NO
RESPONSE message or a BUS +/- SIGNALS OPEN message.
Turn the ignition on.
Using the DRB, attempt to communicate with the following control modules:
Airbag Control Module
Occupant Classification Module - If equipped
Front Control Module - If equipped
Instrument Cluster
Occupant Classification module (If equipped)
Was the DRBIII
t able to communicate with one or more Module(s)?
All
Yes
→ Go To 4
No
→ Go To 9
4
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: If the DRB can not communicate with a single module, refer to the
category list for the related symptom.
Were any problems found?
All
Yes
→ Repair wiring harness/connectors as necessary.
Perform __AIRBAG VERIFICATION TEST - VER 1.
No
→ Go To 5
103
AIRBAG
NO PCI LOOPBACK —
Continued
TEST
ACTION
APPLICABILITY
5
Ensure that the battery is fully charged.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Turn the ignition on and then reconnect the Battery.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output (Run) Circuit and the Fused Ignition Switch Output (Run/Start) Circuit at
the ACM connector.
NOTE: One open circuit will not cause a NO RESPONSE condition.
Is the test light illuminated on both circuits?
All
Yes
→ Go To 6
No
→ Repair the Fused Ignition Switch Output (Run) and Fused
Ignition Switch Output Run-Start circuits for an open.
Perform __AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components, the ignition must be
turned off and the battery must be disconnected.
6
Ensure that the battery is fully charged.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
NOTE: Make sure test light is connected to the Battery positive terminal.
Is the test light illuminated?
All
Yes
→ Go To 7
No
→ Repair the Ground circuit for an open.
Perform __AIRBAG VERIFICATION TEST - VER 1.
When reconnecting Airbag system components, the ignition must be turned
off and the battery must be disconnected.
104
AIRBAG
NO PCI LOOPBACK —
Continued
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