Diagnosis System

DESCRIPTION
1. Data of the system can be read in the Data Link Connector 3 (DLC3) of the vehicle. Therefore, when the system seems to be malfunctioning, use the intelligent tester to check for a malfunction and repair it.

CHECK DLC3

The ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig 1: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RESISTANCE SPECIFICATION

Symbols (Terminal No.)

Terminal Description

Condition

Specified Condition

SIL (7) - SG (5)

Bus "+" line

During transmission

Pulse generation

CG (4) - Body ground

Chassis ground

Always

Below 1 Ω

SG (5) - Body ground

Signal ground

Always

Below 1 Ω

BAT (16) - Body ground

Battery positive

Always

11 to 14 V

CANH (6) - CANL (14)

CAN bus line

Ignition switch off⁽¹⁾

54 to 69 Ω

CANH (6) - CG (4)

HIGH-level CAN bus line

Ignition switch off⁽¹⁾

200 Ω or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Ignition switch off⁽¹⁾

200 Ω or higher

CANH (6)-BAT (16)

HIGH-level CAN bus line

Ignition switch off⁽¹⁾

6 Ω or higher

CANL (14)-BAT (16)

LOW-level CAN bus line

Ignition switch off⁽¹⁾

6 kΩ or higher

NOTE:

⁽¹⁾	Before measuring the resistance, leave the vehicle as it is for at least 1 minute and do not operate the ignition switch, or any other switches or the doors.

If the result is not as specified, DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT:

Connect the cable of the intelligent tester to DLC3, turn the ignition switch to the ON position and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
- If communication is normal when the tester is connected to another vehicle, inspect DLC3 of the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

INSPECT BATTERY VOLTAGE
1. Check the battery voltage.
  Standard voltage: 11 to 14 V
  
  If the voltage is below 11V, replace the battery before proceeding.
CHECK DIAGNOSIS
1. Turn the ignition switch ON.
2. Operate the driver side switch of the master switch.
  
  Fig 2: Identifying Driver Side Switch Of Master Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the blinking pattern of the AUTO light as shown in the illustration.
  
  Fig 3: Auto Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. If pattern (A) is displayed, reset power window regulator motor.
  2. If pattern (B) or (C) is displayed, check the wire harness.
  3. If the normal pattern is displayed, replace the power window master switch.