Diagnosis System

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

LASER BEAM AXIS ADJUSTMENT
1. Use the Techstream to adjust the optical axis (See ADJUSTMENT for the optical axis adjusting operation).
  HINT:
  
  While adjusting the optical axis of the laser sensor, the CRUISE main indicator light illuminates and FC is displayed on the multi-information display.
  
  Fig 1: Identifying CRUISE Main Indicator And Master Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DIAGNOSIS FUNCTION
1. The diagnosis function makes the master warning light and the multi-information display come on, and the CRUISE main indicator light blinks. When a malfunction occurs in the dynamic laser cruise control system, the DTCs are stored in the ECM.
  NOTE:
  - The master warning light goes off if the system returns to normal condition.
    
    Fig 2: Identifying CRUISE Main Indicator And Master Warning Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - Since the stored data in the ECM is erased by disconnecting the EFI and ETCS fuses or the battery terminal, do not disconnect them until the inspection has been completed.
DESCRIPTION
1. The ECM controls the dynamic laser cruise control system of the vehicle. The data and DTCs relating to the dynamic laser cruise control system can be read from the DLC3 of the vehicle. If either DTC or CRUISE OK is not displayed in the multi-information display on the combination meter when checking for DTCs, there may be a problem with the combination meter or the CAN communication and multiplex communication system. Use the Techstream to check and solve the problem.
  
  Fig 3: Identifying DLC3 Connector Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK DLC3

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

Fig 4: Identifying DLC3 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

VOLTAGE AND RESISTANCE SPECIFICATION

Symbols (Terminals 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

10 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 kΩ or higher

CANL (14)-BAT (16)

LOW-level CAN bus line

Ignition switch off⁽¹⁾

6 kΩ or higher

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

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

HINT:

Connect the cable of the Techstream to the DLC3, turn the ignition switch on (IG) and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream.

If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle.
If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.

CHECK INDICATOR
1. Turn the ignition switch on.
2. Check that the CRUISE main indicator light and RADAR READY indicator come on when the main switch ON-OFF button is pushed on, and that the indicator light goes off when the ON-OFF button is pushed off.
  HINT:
  - If the indicator check result shows a problem, proceed to troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ) for the combination meter information.
    
    Fig 5: Identifying Master Warning Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - If a malfunction occurs in the vehicle speed sensors, the stop light switch, or other related parts during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and blinks the CRUISE main indicator light. During constant speed control, the master warning light blinks. During vehicle-to-vehicle distance control, the master warning light comes on. This indicator light informs the driver of the malfunction. At the same time, the malfunction is stored as a diagnostic trouble code.
    
    Fig 6: Identifying DLC3 Connector Terminal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002