Air Bag Indicator Circuit Malfunction (Passenger)
Air Bag Indicator Circuit Malfunction (Passenger)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The passenger air bag ON/OFF indicators are used to notify the driver when the passenger presence system has enabled or disabled the passenger instrument panel air bag. When the ignition is turned ON, the ignition voltage is supplied to the passenger presence module. When the inflatable restraint sensing and diagnostic module (SDM) receives the appropriate serial data message from the passenger presence module the SDM will then provide voltage to the appropriate indicator.
Reference Information
Schematic Reference
SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
SIR System Description and Operation (SIR System)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Note: The passenger air bag ON and OFF indicators may not operate as expected if there are supplemental inflatable restraint (SIR) DTCs. Repair all SIR DTCs before proceeding with this diagnostic.
1. Ignition ON.
2. The passenger seat unoccupied.
3. Verify the scan tool Passenger Seat Occupancy Status parameter displays Empty.
• If Passenger Seat Occupancy Status parameter does not display Empty.
• Refer to Circuit/System Testing
• If Passenger Seat Occupancy Status parameter displays Empty.
4. The passenger seat unoccupied.
5. Verify the passenger air bag OFF indicator is illuminated.
• If passenger air bag OFF indicator is not illuminated.
• Refer to Circuit/System Testing
• If passenger air bag OFF indicator is illuminated.
6. The passenger seat occupied.
7. Verify the scan tool Passenger Seat Occupancy Status parameter displays Occupied.
• If the scan tool Passenger Seat Occupancy Status parameter does not display Occupied.
• Refer to Circuit/System Testing
• If the scan tool Passenger Seat Occupancy Status parameter displays Occupied.
8. With the passenger seat occupied.
9. Verify the passenger air bag ON indicator is illuminated.
• If passenger air bag ON indicator is not illuminated.
• Refer to Circuit/System Testing
• If passenger air bag ON indicator is illuminated.
10. All OK.
Circuit/System Testing
Note: removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.
* Passenger air bag disable on/off indicator.
* Passenger air bag disable on/off indicator wiring harness.
1. Ignition OFF.
2. Disconnect the harness connector at the P14 passenger air bag disable indicator.
3. Test for less than 5 ohm between the ground circuit terminal 2 and ground.
• If 5 ohm or greater
1. Ignition OFF.
2. Disconnect the harness connector at the K36 SDM.
3. Test for less than 2 ohm in the low reference circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K36 SDM.
• If less than 5 ohm
4. Ignition ON.
5. The passenger seat occupied.
6. Test for less than 11 V between the control circuit terminal 3 and ground.
• If 11 V or greater
1. Ignition OFF.
2. Disconnect the harness connector at the K36 SDM.
3. Ignition ON.
4. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K36 SDM.
• If less than 11 V
7. The passenger seat unoccupied.
8. Test for greater than 25 ohm between the control circuit terminal 3 and ground.
• If 25 ohm or less
1. Disconnect the harness connector at the K36 SDM.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohm in each control circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K36 SDM.
• If greater than 25 ohm
9. The passenger seat unoccupied.
10. Test for less than 11 V between the control circuit terminal 1 and ground.
• If 11 V or greater
1. Ignition OFF.
2. Disconnect the harness connector at the K36 SDM.
3. Ignition ON.
4. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K36 SDM.
• If less than 11 V
11. The passenger seat occupied.
12. Test for greater than 25 ohm between the control circuit terminal 1 and ground.
• If 25 ohm or less
1. Disconnect the harness connector at the K36 SDM.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohm in each control circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K36 SDM.
• If greater than 25 ohm
13. Replace the P14 passenger air bag disable indicator.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* SIR/SRS Wiring Repairs (SIR/SRS Wiring Repairs)
* Inflatable Restraint Instrument Panel Module Indicator Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming