B1BBB

B1BBB-PASSENGER SEAT WEIGHT SENSOR INPUTS SHORTED TOGETHER

B1BBB-Passenger Seat Weight Sensor Inputs Shorted Together:

WHEN MONITORED
While the CAN bus ignition status is in IGN_RUN.

SET CONDITION
If the OCM detects any two sensors voltages below 20mV for 10 minutes while any other sensor is greater than 40mV.

NOTE:
- 1 a/d count is equal to 5 mV.
- A shorted supply circuit will cause a "NO RESPONSE FROM OCM" condition.

POSSIBLE CAUSES
- OCS sensor circuits shorted together
- Occupant classification module (OCM)

DIAGNOSTIC TEST

1. VERIFY THAT B1BBA-PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT DTC IS ACTIVE
With the scan tool, read OCM DTCs.

Q: Does the scan tool display active: B1BBB-PASSENGER SEAT WEIGHT SENSOR INPUTS SHORTED TOGETHER?

YES: Replace the OCM. Perform the OCS VERIFICATION REQUIRED procedure. B1BA7
NO: Go To 2

2. 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.

Q: 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. Perform OCS VERIFICATION TEST - VER 1. OCS Verification Test
NO: Go To 3

3. TEST FOR 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.

Q: Are any ACTIVE DTCs present?

YES: Select the appropriate symptom.
NO: No problem found at this time. Erase all codes before returning vehicle to customer.