Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, & 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.

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
1. Diagnose and repair the DTCs. Refer to the DIAGNOSTIC CODE INDEX for a complete list of symptoms.
No
1. Go To step 2).
2) VERIFY THAT DTC B1B8D-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW IS ACTIVE
With the scan tool, read OCM DTCs.

Does the scan tool display active: B1B8D-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW?

Yes
1. Go To step 3).
No
1. Go To step 7).
3) INSPECT PASSENGER SEAT HARNESS WIRES & CONNECTORS
WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Using the wiring diagram/schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chaffed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated 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.
1. Replace the Passenger Seat Harness in accordance with the Service Information.
2. Perform *OCS VERIFICATION TEST - VER 1 . .
No
1. Go To step 4).
4) VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY
Verify that the Passenger Seat Harness is routed correctly.

Is the Passenger Seat Harness routed correctly?

Yes
1. Go To step 5).
No
1. Reroute the Passenger Seat Harness as necessary.
2. Perform *OCS VERIFICATION TEST - VER 1 . .
5) CHECK (R262) SEAT POSITION SENSOR DATA-PASSENGER CIRCUIT & (R264) SEAT POSITION SENSOR VOLTAGE-PASSENGER CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking Seat Position Sensor Data-Passenger Circuit & Seat Position Sensor Voltage-Passenger Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (R262) Seat Position Sensor Data-Passenger circuit.

Measure the resistance between ground and the (R264) Seat Position Sensor Voltage-Passenger circuit.

Is the resistance below 10k ohms on either circuit?

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.
1. Replace the Passenger Seat Harness in accordance with the service information.
2. Perform *OCS VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) CHECK (R262) SEAT POSITION SENSOR DATA-PASSENGER CIRCUIT & (R264) SEAT POSITION SENSOR VOLTAGE-PASSENGER CIRCUIT FOR AN OPEN

Fig 2: Checking Seat Position Sensor Data-Passenger Circuit For Open
Courtesy of DAIMLERCHRYSLER CORP.

Fig 3: Checking Seat Position Sensor Voltage-Passenger Circuit For Open
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the OCM C1 connector.

Measure the resistance of the (R262) Seat Position Sensor Data-Passenger circuit between the OCM C1 connector and the Passenger Seat Track Position Sensor connector.

Measure the resistance of the (R264) Seat Position Sensor Voltage-Passenger circuit between the OCM C1 connector and the Passenger Seat Track Position Sensor connector.

Is the resistance of either circuit above 5.0 ohms?

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.
1. Replace the Passenger Seat Harness in accordance with the Service Information.
2. Perform *OCS VERIFICATION TEST - VER 1 .
No
1. Replace the OCM in accordance with the service information.
2. Perform *OCS VERIFICATION TEST - VER 1 .
7) TEST FOR AN INTERMITTENT CONDITION
With the scan tool, record and erase all DTC's from the OCM.

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 minutes before 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 ignition on, then reconnect the battery.

With the scan tool 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 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?

Yes
1. Select the appropriate symptom from Symptom List.
No
1. No problem found at this time. Erase all codes before returning vehicle to customer.