Seat Belt Indicator Circuit Malfunction - Passenger
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Seat Belt Indicator Circuit Malfunction - Passenger
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Diagnostic Fault Information
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Circuit
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Short to Ground
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High Resistance
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Open
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Short to Voltage
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Signal Performance
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Passenger Seat Belt Switch Signal
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1
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2
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2
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2
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-
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Passenger Seat Belt Switch Low Reference
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-
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2
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2
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2
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-
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1. Indicator will remain ON with seat belt buckled.
2. Indicator will illuminate only for the bulb check.
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Circuit/System Description
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When an individual is sitting in the passenger seat the passenger presence sensor detects the individual. A signal to the SDM indicates a person is in the passenger seat. The SDM will turn the passenger seat belt indicator. The passenger 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 passenger seat belt via a hard wire to the hazard lamps switch. After receiving the message, the hazard lamps switch controls the illumination of the passenger 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
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Circuit/System Verification
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1.
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If the passenger seat belt indicator is always ON, even with no one sitting in the passenger seat, check the passenger presence detection sensor signal circuit for a short to ground.
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3.
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Ignition ON, with a scan tool perform the Passenger Seat Belt Reminder Indicator On/Off Control Function and verify the passenger seat belt indicator turns on and off.
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4.
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If the indicator is always ON or always OFF, refer to Seat Belt Inidicator Malfunction.
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5.
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With the scan tool monitor the Passenger Seat Belt Status parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when buckling and unbuckling the seat belt.
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6.
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If the values do not change, refer to Seat Belt Switch Malfunction.
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Seat Belt Switch Malfunction
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1.
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Note
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When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
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•
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B88 Seat belt switch
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•
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Seat belt switch harness connector
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•
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K36 SDM
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•
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SDM harness connector
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Ignition OFF, disconnect the harness connector at the B88 passenger seat belt switch.
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2.
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Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal replace the K36 SDM.
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4.
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Ignition ON, verify the scan tool Passenger Seat Belt Status parameter displays Buckled.
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5.
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If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal replace the K36 SDM.
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6.
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Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Passenger Seat Belt Status parameter displays Unbuckled.
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7.
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If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the K36 SDM.
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Seat Belt Indicator Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the S26 hazard lamps switch.
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2.
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Test for less than 5 Ω between the ground circuit terminal 1 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Connect a test lamp between the control circuit terminal 4 and ground.
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5.
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Ignition ON, command the Passenger Seat Belt Reminder Indicator ON and OFF with a scan tool, the test lamp should turn ON and OFF while changing between the commanded states.
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6.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal replace the K36 SDM.
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7.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the K36 SDM.
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1.
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Ignition OFF, disconnect the harness connector at the B88 seat belt switch.
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2.
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Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2, at the switch, with the switch in the open position.
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4.
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Test for less than 5 Ω between the signal circuit terminal 1and the low reference terminal 2, at the switch, with the switch in the closed position.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for SDM and instrument panel cluster replacement, setup and programming
