Diagnosis System

DIAGNOSIS FUNCTION
1. The diagnosis function makes the master warning light and the multi-information display turn on, and the CRUISE main indicator light blinks as shown in the illustration. When a malfunction occurs in the dynamic radar cruise control system, the DTCs are stored in the hybrid vehicle control ECU.
  NOTE:
  - The master warning light turns off if the system returns to a normal condition.
    
    Fig 1: Identifying CRUISE Main Indicator Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - Since the stored data in the hybrid vehicle control ECU 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 hybrid vehicle control ECU controls the dynamic radar cruise control system of the vehicle. The data and DTCs relating to the dynamic radar 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 2: Blinking Pattern Of CRUISE Main Indicator Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK DLC3

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

Fig 3: Identifying DLC3 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

VOLTAGE AND RESISTANCE SPECIFICATION

Terminal No. (Symbols)

Terminal Description

Condition

Specified Condition

7 (SIL) - 5 (SG)

Bus "+" line

During transmission

Pulse generation

4 (CG) - Body ground

Chassis ground

Always

Below 1 Ω

5 (SG) - Body ground

Signal ground

Always

Below 1 Ω

16 (BAT) - Body ground

Battery positive

Always

11 to 14 V

6 (CANH) -14 (CANL)

CAN bus line

Power switch OFF⁽¹⁾

54 to 69 Ω

6 (CANH) - Battery positive

HIGH-level CAN bus line

Power switch OFF⁽¹⁾

200 Ω or more

6 (CANH) - 4 (CG)

HIGH-level CAN bus line

Power switch OFF⁽¹⁾

200 Ω or more

14 (CANL) - Battery positive

LOW-level CAN bus line

Power switch OFF⁽¹⁾

5 MΩ or higher

14 (CANL) - 4 (CG)

LOW-level CAN bus line

Power switch OFF⁽¹⁾

3 kΩ or higher

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

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

HINT:

Connect the cable of the Techstream to the DLC3, turn the power 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 on 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 power switch on (IG).
2. Check that the CRUISE main indicator light and RADAR READY indicator turn on when the main switch ON-OFF button is pushed on, and that the indicator light turns off when the ON-OFF button is pushed off.
  HINT:
  
  Fig 4: Identifying Indicator
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - If the indicator check result shows a problem, proceed to HOW TO PROCEED WITH TROUBLESHOOTING for the combination meter article.
  - 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. This indicator light informs the driver of the malfunction. At the same time, the malfunction is stored as a diagnostic trouble code.
    
    Fig 5: Blinking Pattern Of CRUISE Main Indicator Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002