Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 716

B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

OCS SEAT WEIGHTS MRL #9077

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•

When Monitored:
While the CAN bus ignition status is in IGN_RUN, the module checks the sensor input ranges.

•

Set Condition:
If the module detects the difference between 2 sensors is less than 3 A/D (15 mV) counts for 10 consecutive
minutes while at least one sensor count is changing and greater than 8 A/D (40 mV) counts.

Possible Causes

OTHER SEAT WEIGHT SENSOR FAULTS ACTIVE IN THE OCM

PASSENGER SEAT HARNESS WIRES CHAFED, PIERCED, PINCHED, PARTIALLY BROKEN

PASSENGER SEAT HARNESS CONNECTOR TERMINALS BROKEN, BENT PUSHED OUT, SPREAD,
CORRODED, CONTAMINATED

PASSENGER SEAT WEIGHT SENSORS

DAMAGE TO THE PASSENGER SEAT STRUCTURE, RISER ASSEMBLY, CROSSMEMBERS, SEAT TRACKS,
FLOOR PAN

OCCUPANT CLASSIFICATION MODULE (OCM)

Diagnostic Test

1.

CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT
CLASSIFICATION MODULE (OCM)

NOTE: Ensure the battery is fully charged.

NOTE: When reconnecting Airbag system components, the ignition must be turned off and the battery must
be disconnected.
Turn the ignition on, then off, and then on again.

NOTE: This DTC will take 10 minutes to mature, allow plenty of time for the code to mature between as you
work through the test steps.
With the scan tool, read Occupant Classification Module (OCM) DTCs.

Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?

Yes

>> Diagnose and repair the DTCs. Refer to the Table of Contents in this Section for a complete list of

symptoms.

No

>> Go To 2

2.

VERIFY THAT DTC B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE IS ACTIVE

With the scan tool, read OCM DTCs.

Does the scan tool display active: B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE?

Yes

>> Go To 3

No

>> Go To 6

3.

CHECK FOR OTHER ACTIVE PASSENGER SEAT WEIGHT SENSOR FAULTS IN THE OCM

With the scan tool, read OCM DTCs.

Does the scan tool display any other active Seat Weight Sensor DTCs?

Yes

>> Diagnose and repair the DTCs. Refer to the Table of Contents in this Section for a complete list of

symptoms.

No

>> Go To 4

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4.

INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS

WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two min-
utes before proceeding.
Using the wiring diagram/schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look
for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contam-
inated terminals.

Are any of these conditions present?

Yes

>>

NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or
testing for is present in the Seat Harness.

Replace the Passenger Seat Harness in accordance with the Service Information.

Perform OCS VERIFICATION TEST - VER 1.

No

>> Go To 5

5.

PERFORM OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST

Perform a visual inspection of the Passenger Seat, wiring, connectors, risers, sensors, and retainers. Look for
chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated
terminals. Also, inspect for damaged or bent risers, a damaged or bent seat and seat structure, damaged or bent
seat tracks, and damaged or loose sensors. Repair or replace any problems found in accordance with the service
information and then continue this procedure. Refer to 23 - BODY/SEATS.

WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.

NOTE: Failure to follow test instructions or aborting the test will cause faults to set when performing the
Occupant Classification Module System Verification Test. To prevent faults due to process errors: Verify
That All Tests Steps That Led You Here Were Performed As Directed; Verify That The Ignition Is In Run; Wait
30 Seconds After Changing The Seat Weight Before Proceeding To Allow The System To Stabilize; Only
Press Scan Tool Buttons When Directed To Do So; and Perform The Occupant Classification Module System
Verification Test To Completion.
With the scan tool in OCM, select More Options, select System Tests, and select Occupant Classification Module
System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is
complete, wait two minutes, and then proceed as follows.

With the scan tool, read OCM DTCs.

Does the scan tool display any active B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE
DTC?

Yes

>> Perform the *Diagnosis/Checkout Procedure For Seat Weight Sensors.

Perform OCS VERIFICATION TEST - VER 1.

Other DTCs ACTIVE

Diagnose and repair the DTCs. Refer to the Table of Contents in this Section for a complete list of
symptoms.

No

>> Perform OCS VERIFICATION TEST - VER 1.

6.

TEST FOR INTERMITTENT CONDITION

With the scan tool, record and erase all DTCs from all Airbag modules.

If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.

WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two min-
utes before proceeding.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or con-
taminated terminals.

The following additional checks may assist you in identifying a possible intermittent problem.

Reconnect any disconnected components and harness connector.

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WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.
With the scan tool, monitor active codes as you work through the following steps.

NOTE: This DTC will take 10 minutes to mature, allow plenty of time for the code to mature between as you
work through the test 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 the active DTC in ques-
tion.

Does the scan tool display any ACTIVE DTCs?

Yes

>> Select appropriate symptom from Symptom List.

No

>> No problem found at this time. Erase all codes before returning vehicle to customer.

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