9-5 Sport Wagon (9600) L4-2.3L Turbo (B235) (2003)
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The belt warning light is turned on when the ignition is ON (+15 and +5 4 circuits) and when the driver's or front-seat passenger's seat belt is not
fastened.
The belt contact (70D/70P) is closed when the seat belt is not fastened, and open when it is.
The front passenger seat cushion contains a sensor which detects load. The passenger seat sensor (614P) is connected across pins 5 and 21 of TWICE.
Voltage is supplied to the sensor from pin 5 via a resistor in TWICE, and pin 21 is grounded.
The sensor resistance varies according to the load it carries. TWICE detects the voltage across the sensor. When the sensor resistance is less than 50
kohm, the load on the seat is considered to correspond to a person sitting on the seat.
Burn-off
To maintain the best possible contact in the sensor connections, TWICE sends a voltage across pins 5 and 21 to burn off any oxide. This is done for 1
second with the ignition ON.
To ensure that the burn-off current remains sufficiently high, a diode is connected in parallel across the sensor connectors. The diode conducts at low
resistance, which means that the burn off current passes through the diode instead of the sensor.
Indication
