Circuit Inspection

Inspection Procedure 

1. Inspect indicator  .

   Check: 

   Turn ON and OFF the switch corresponding to the following indicators and check if the indicator lights up or goes off accordingly.

   • Door indicator (Open/close operation of any of doors)
   • Brake indicator (ON/OFF operation of the parking brake)
   • Seat belt indicator (ON/OFF operation of the buckle switch)

   No: Go to Next Step 

   Yes: Normal communication  .

2. Any of them do not light  .

   No: Go to Next Step 

   Yes: Flow chart No. 5  .

3. All of them do not light  .

   Communication error. Wire harness faulty  .

Inspection Procedure 

1. Check the meter operation  .

   Check: 

   With the ignition switch ON, nothing is displayed.

   Go to Next Step 

2. Check the positive terminal of IG  .

   Check: 

   Check if the fuse (GAUGE 10A) is normal or not. Turn the ignition switch ON and check that a voltage of 10 - 14 V is applied between the meter connector terminal A22 (IG+) and the body ground.

   Yes: Go to Next Step 

   No: Fuse faulty. Wire harness faulty  .

3. Check the grounding  .

   Check: 

   Disconnect the meter connector and check that there is continuity between terminal A15/A14 on the vehicle side connector and the body ground.

   Yes: Go to Next Step 

   No: Body ground faulty. Wire harness faulty  .

   Improper connection of the meter connector. Communication meter ECU faulty  .

Inspection Procedure 

1. Check the brake ECU  .

   Check: 

   Perform a diagnosis check of the brake system.

   Proceed to next circuit inspection shown in PROBLEM SYMPTOMS TABLE .

   No: Go to Next Step 

   Yes: Replace brake ECU  .

2. Check the vehicle speed signal input  .

   Preparation: 

   Turn the ignition switch ON.

   Check: 

   Disconnect the meter connector, drive the vehicle at a speed of 2 - 4 km/h and check that continuity between terminal A9 on the vehicle side connector and the body ground is repeatedly turned ON and OFF.

   Yes: Go to Next Step 

   No: Wire harness faulty. Speed output terminal in brake ECU faulty  .

   Combination meter ECU faulty  .

Inspection Procedure 

1. Fuel gauge diagnosis check. (See  PRE-CHECK  ) 

   Go to Next Step 

2. Reset  INCLINATION SENSOR  .

   Go to Next Step 

3. Fuel sender  GAUGE CHECK  .

   NG: Rfuel tank  .

   OK: Go to Next Step 

4. Multiplex communication circuit check INSPECTION PROCEDURE .

   Check: 

   Check if the communication between the combination meter and the multiplex communication circuit is normal or not.

   No: Multiplex communication circuit error. Wire harness faulty  .

   Yes: Go to Next Step 

5. Check the body ECU  .
   Fig 1: Checking Body ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Check: 

   With the fuel sender gauge connector connected, check if the voltage between each of terminal 1 (FV), 5 (FR) and 6 (FE) of the vehicle side wire harness and connector and the body ground is normal or not.

   TERMINALS VOLTAGE
   
   

   Condition	Terminal	Specified value
   Ignition switch ON	1 (FV) - Body ground	4.5 - 5.5 V
   Ignition switch ON	5 (FR) - Body ground	0.5 - 5.5 V
   constant	6 (FE) - Body ground	Continuity is always identified.

   No: Body ECU faulty  .

   Yes: Combination meter ECU faulty  .

Inspection Procedure 

1. Multiplex communication circuit input indicator or warning  .

   Go to Next Step 

2. Communication check  .

   Check: 

   Check if the communication between the combination meter and the multiplex communication circuit is normal or not.

   Yes: Go to Next Step 

   No: Communication error. Wire harness faulty  .

3. Check the bulb or circuit plate  .

   Check: 

   Check if the bulb circuit plate is normal or not. Check open or short circuit in wire harness.

   Yes: Go to Next Step 

   No: Bulb or circuit plate faulty  .

4. Check the corresponding switch or ECU  .

   Check: 

   Check if the corresponding switch or ECU is normal or not.

   Yes: Combination meter ECU faulty 

   No: Corresponding switch or ECU faulty  .