Passenger Presence System Indicator Circuit Malfunction
Passenger Presence System Indicator Circuit Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The PASSENGER AIR BAG ON/OFF indicators located on the rearview mirror are used to notify the driver when the passenger presence system (PPS) has enabled or disabled the instrument panel (I/P) inflator module. The PPS air bag indicators will also inform the driver of any PPS malfunctions. When the ignition is turned on, the PPS module is supplied with ignition 1 voltage and commands both passenger air bag ON/OFF indicators ON for 5 seconds. The PPS module conducts tests on the PPS components and circuits while both passenger air bag ON/OFF indicators are ON. If no malfunctions are detected the PPS module will turn the passenger air bag indicator ON or OFF depending on the status of the PPS.
Reference Information
Schematic Reference
SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
SIR System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
With the passenger seat occupied and unoccupied the inflatable restraint passenger air bag ON/OFF indicator should switch states within 5 seconds.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the inside rear view mirror.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 13 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance, if the circuit tests normal and the ignition fuse is open, replace the inside rear view mirror.
3. With the right front passenger seat occupied, verify that a test lamp illuminates between the control circuit terminal 3 and B+.
• If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PPS module.
4. With the right front passenger seat vacant, verify that a test lamp does not illuminate between the control circuit terminal 3 and B+.
• If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the PPS module.
5. With the right front passenger seat vacant, verify that a test lamp illuminates between the control circuit terminal 4 and B+.
• If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PPS module.
6. With the right front passenger seat occupied, verify that a test lamp does not illuminate between the control circuit terminal 4 and B+.
• If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the PPS module.
7. If all circuits test normal, test or replace the inside rear view mirror.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Inside Rearview Mirror Replacement (Inside Rearview Mirror Replacement)
* Control Module References (Programming and Relearning)for PPS module replacement, setup, and programming