Seat Belt. Seat Belt Warning System Front Passenger Side Seat Belt Warning Light Malfunction

Vehicle Interior. Corolla. Zre142 Aze141

Seat Belt. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

PERFORM ACTIVE TEST USING TECHSTREAM

CHECK WIRE HARNESS (BATTERY POSITIVE AND BODY GROUND)

CHECK HARNESS OR CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER)

INSPECT TELLTALE LIGHT ASSEMBLY

SEAT BELT WARNING SYSTEM - Front Passenger Side Seat Belt Warning Light Malfunction

DESCRIPTION

The occupant detection ECU detects the state of the front seat inner belt assembly RH and road sensor when the front passenger seat is occupied with the ignition switch on (IG). If the front passenger seat belt is not fastened, the front seat belt warning light on the telltale light assembly blinks. If the seat belt is fastened, the warning light goes off.

WIRING DIAGRAM

Corolla. Zre142 Aze141.Seat Belt.Seat Belt Warning System.Seat Belt Warning System Front Passenger Side Seat Belt Warning Light Malfunction

INSPECTION PROCEDURE

NOTICE:

The seat belt warning system uses CAN. Before troubleshooting the seat belt warning system, perform Communication Function Check by following How to Proceed with Troubleshooting to confirm that the communication systems are normal.

1.CHECK FOR DTC

Check for DTCs.

Result:

Result	Proceed to
DTC is not output	A
CAN communication system DTC is output	B
Occupant detection system DTC is output	C

GO TO CAN COMMUNICATION SYSTEM (COROLLA_ZRE142 RM000002B6V03LX.html)

GO TO OCCUPANT CLASSIFICATION SYSTEM (COROLLA_ZRE142 RM000001OQL02UX.html)

A

2.PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3.

Turn the ignition switch to ON.

Turn the Techstream on.

Enter the following menus: Body Electrical / Combination Meter / Active Test.

Check the Front passenger side seat belt warning light by performing the Active Test.

Combination Meter
Tester Display	Test Part	Control Range	Diagnostic Note
Front Passenger Side Seat Belt	Front passenger side seat belt warning light	Front passenger side seat belt warning light is OFF / ON	Confirm that the vehicle is stopped, engine idling

OK:: Switch condition (ON/OFF) can be switched by Active Test.

Go to step 3

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (COROLLA_ZRE142 RM000000UWV074X.html)

3.CHECK WIRE HARNESS (BATTERY POSITIVE AND BODY GROUND)

Disconnect the E124*1 or E48*2 connector.
1. *1: for Telltale Light (w/o Clock)
2. *2: for Telltale Light (w/ Clock)

for Telltale Light (w/o Clock):
1. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Switch Condition
  Specified Condition
  E124-4 (B) - Body ground
  Ignition switch on (IG)
  11 to 14 V

for Telltale Light (w/ Clock):
1. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Switch Condition
  Specified Condition
  E48-3 (B) - Body ground
  Ignition switch on (IG)
  11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

OK

4.CHECK HARNESS OR CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER)

Disconnect the E46 connector.

for Telltale Light (w/o Clock):
1. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  E124-3 (L) - E46-1 (WRNP)
  Always
  Below 1 Ω
  E124-3 (L) or E46-1 (WRNP) - Body ground
  Always
  10 kΩ or higher

for Telltale Light (w/ Clock):
1. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  E48-8 (L) - E46-1 (WRNP)
  Always
  Below 1 Ω
  E48-8 (L) or E46-1 (WRNP) - Body ground
  Always
  10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.INSPECT TELLTALE LIGHT ASSEMBLY

Check the telltale light assembly (front passenger seat belt warning light) condition.

for Telltale Light (w/o Clock):
1. Apply battery voltage to the connector according to the table below.
  OK:
  Tester Connection
  Condition
  Specified Condition
  Battery positive (+) → E124-4 (B)
  Battery negative (-) → E124-3 (L)
  Always
  Seat belt warning light comes on

for Telltale Light (w/ Clock):
1. Apply battery voltage to the connector according to the table below.
  OK:
  Tester Connection
  Condition
  Specified Condition
  Battery positive (+) → E48-3 (B)
  Battery negative (-) → E48-8 (L)
  Always
  Seat belt warning light comes on

REPLACE TELLTALE LIGHT ASSEMBLY (COROLLA_ZRE142 RM000002XFP01GX.html)

REPLACE COMBINATION METER ASSEMBLY (COROLLA_ZRE142 RM0000024D7032X.html)

Tester Connection	Switch Condition	Specified Condition
E124-4 (B) - Body ground	Ignition switch on (IG)	11 to 14 V

Tester Connection	Condition	Specified Condition
E124-3 (L) - E46-1 (WRNP)	Always	Below 1 Ω
E124-3 (L) or E46-1 (WRNP) - Body ground	Always	10 kΩ or higher