B1771

DTC B1771

Circuit Description

The seat belt buckle switch circuit - right front consists of a seat belt buckle switch and the passenger presence system (PPS) module. The PPS module monitors the seat belt buckle switch for a buckled/unbuckled state. If the sensing and diagnostic module (SDM) detects a malfunction within the seat belt buckle switch circuit, a DTC will be set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1771 Passenger Seat Belt Sensor Circuit

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The SDM detects a malfunction in the seat belt buckle switch circuit.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Diagnostic Aids

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:

* An open or high resistance in the seat belt buckle switch - right circuit
* A short to ground or voltage in the seat belt buckle switch - right circuit
* A malfunctioning seat belt buckle switch - right
* A short between the seat belt buckle switch - right circuits
* An internal PPS module malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

Test Description

Step 1 - Step 10:

The numbers below refer to the step numbers on the diagnostic table.
6. Tests the seat belt buckle switch - right circuits for an open or high resistance.
Tests the seat belt buckle switch - right circuits for a short to ground.
Tests the seat belt buckle switch - right circuits for a short to voltage.
8. Tests to see if the malfunction is caused by the seat belt buckle switch.