Orlando

Seat Belt Indicator Circuit Malfunction - Driver

The driver seat belt switch is a 2-wire switch wired to the inflatable restraint sensing and diagnostic module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The SDM sends the status of the driver seat belt via serial data to the instrument panel cluster. After receiving the message, the instrument panel cluster controls the illumination of the driver seat belt indicator.

Schematic Reference

Seat Belt Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Command the instrument cluster all indicators ON and OFF with a scan tool. The driver seat belt indicator should turn ON and OFF as commanded.

⇒	If the driver seat belt indicator does not turn ON and OFF as commanded Replace the P16 instrument cluster.

⇓	If the driver seat belt indicator does turn ON and OFF as commanded

2. Monitor the scan tool Driver Seat Belt Switch parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when changing seat belt states.

⇒	If the scan tool Driver Seat Belt Switch parameter does not display Buckled and Unbuckled when changing seat belt states

Refer to Circuit/System Testing.

⇓	If the scan tool Driver Seat Belt Switch parameter does display Buckled and Unbuckled when changing seat belt states

3. All OK.

Note: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

1. Ignition OFF. Disconnect the harness connector at the B88D seat belt switch-driver.
2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

⇒	If 5 Ω or greater

2.1.	Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module.

2.2.	Test for less than 2 Ω in each 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 less than 5 Ω

3. Ignition ON.
4. Verify the scan tool Driver Seat Belt Status parameter displays Buckled.

⇒	If the scan tool Driver Seat Belt Status parameter does not display Buckled

4.1.	Ignition OFF. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module.

4.2.	Test for infinite resistance between the seat belt switch signal circuit terminal 1 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 the scan tool Driver Seat Belt Status parameter does display Buckled

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Driver Seat Belt Status parameter displays Unbuckled.

⇒	If the scan tool Driver Seat Belt Status parameter does not display Unbuckled

6.1.	Ignition OFF. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module. Ignition ON.

6.2.	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.

6.3.	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 the scan tool Driver Seat Belt Status parameter does display Unbuckled

7. Test or replace the B88D seat belt switch-driver.

1. Ignition OFF. Disconnect the harness connector at the B88D seat belt switch-driver. The B88D seat belt switch-driver in the open position.
2. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2 at the B88D seat belt switch-driver.

⇒	If there is not infinite resistance

Replace the B88D seat belt switch-driver.

⇓	If there is infinite resistance

3. The B88D seat belt switch-driver in the closed position.
4. Test for less than 1 Ω between the signal circuit terminal 1 and the low reference terminal 2 at the B88D seat belt switch-driver.

⇒	If 1 Ω or greater

Replace the B88D seat belt switch-driver.

⇓	If less than 1 Ω

5. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.