Circuit/System Testing

Seat Belt Switch Malfunction

NOTE:
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
• B153 Seat Belt buckle
• Seat belt switch harness connector
• K36 Inflatable Restraint Sensing and Diagnostic Module
• inflatable restraint sensing and diagnostic module harness connector
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B153P Seat Belt Buckle - Passenger. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 5 Ω between the low reference circuit terminal B and ground.
   • If 5 Ω or greater 
   1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
   2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
      • If less than 5 Ω 
3. Ignition ON.
4. Verify the scan tool Passenger Seat Belt Status parameter is Buckled.
   • If not Buckled 
   1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
   2. Test for infinite resistance between the seat belt switch signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
   • If Buckled 
5. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B.
6. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled.
   • If not Unbuckled 
   1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
   2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
   3. Test for less than 2 Ω in each circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
   • If Unbuckled 
7. Test or replace the B153P Seat Belt Buckle - Passenger.

Seat Belt Indicator Malfunction

1. Ignition OFF, disconnect the harness connector at the S48B Multifunction Switch - Overhead Console.
2. Test for less than 10 Ω between the ground circuit terminal 19 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
3. Passenger seat occupied.
4. Test for less than 11 V between the control circuit terminal 13 and ground.
   • If 11 V or greater 
   1. Ignition OFF.
   2. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
   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 Inflatable Restraint Sensing and Diagnostic Module.
   • If less than 11 V 
5. Test for greater than 25 Ω between the control circuit terminal 13 and ground.
   • If 25 Ω or less 
   1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
   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 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
   • If greater than 25 Ω 
6. Test or replace the S48B Multifunction Switch - Overhead Console.