Displaying & Reading Trouble Codes

NOTE: This is the only information provided by the manufacturer for Reading Diagnostic Trouble Codes for this system.

PRE-CHECK

1. DIAGNOSIS SYSTEM




a. Check the indicator light.

1. Turn ignition switch ON.
2. Check that height control indicator light and height control OFF indicator light go on for 2 seconds.

If the indicator does not light, inspect the height control OFF indicator light circuit and height control indicator light circuit.




b. In case of not using LEXUS hand-held tester:
Check the DTC.

1. Check the battery positive voltage.
2. Check that the generator is generating electricity when engine running.
3. Check that other system is normal.
4. Using SST connect terminals between Tc and E1 of DLC1.
SST 09843-18020

5. Turn ignition switch ON.




6. Read the DTC output by height control OFF indicator light on the combination meter.

HINT:
- If no code appears, inspect the Tc terminal circuit or height control OFF indicator light circuit.




- As an example, the blinking patterns for normal code, 11 and 31 are as shown in the illustration.

7. Codes are explained in the code table.
8. After completing the check, disconnect terminals Tc and E1, and turn off the display.

HINT: In the event of 2 or more malfunction codes, indication will begin from the smaller numbered code and continue in order to the larger.




c. In case of using LEXUS hand-held tester:
Check the DTC.

1. Hook up the LEXUS hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Read the DTCs by following the prompts on the tester screen.

HINT: Please refer to the LEXUS hand-held tester operator's manual for further details.




d. In case of not using the LEXUS hand-held tester:
Clear the DTC.

1. Using SST connect terminals Tc and E1 of DLC1.
SST 09843-18020

2. Turn the ignition switch ON.
3. Depress the brake pedal 8 or more times within 3 seconds.

HINT: By completing the above operation, the DTC of the ABS will be cancelled out.




e. In case of using the LEXUS hand-held tester:
Clear the DTC.

1. Hook up the LEXUS hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Operating the LEXUS hand-held tester to erase the codes. (See LEXUS hand-held tester operator's manual.)

2. INPUT SIGNAL CHECK (TEST MODE CHECK)

HINT: This function check if signals from the steering sensor, stop light switch, etc. are being input normally to the ECU.

a. In case of not using LEXUS hand-held tester:
Check the input signal.

1. Turn the ignition switch OFF.
2. Set each of the check items in the table to the condition in Operation (A).




3. Using SST, connect terminals Ts and E1 of DLC1.
SST 09843-18020

4. Turn ignition switch ON.






HINT:
- At this time the height control OFF indicator light come on 2 seconds. After, this light flashes at 0.25 seconds intervals.
- When the height control OFF indicator is not flashes, check the Ts terminal circuit.

5. Each of the check items is set to the condition in Operation (B).






HINT: When operation of the check items, the height control OFF indicator light come on 1 second.




6. Using SST, connect terminal Tc and E1 of DLC1.
SST 09843-18020

HINT: This should be done while you connect terminals Ts and E1.




7. Read the test DTC output by height control OFF indicator light.





HINT:
- As an example, the blinking patterns for codes normal and 81 are as shown in the illustration.
- If 2 or more malfunction are indicated at the same time, the lowest numbered code will be displayed first.
- When the DTC is not output, check the Tc terminal circuit.

8. Check the malfunction Using the code table.
9. Desert from the input signal check mode. With the ignition switch OFF, disconnect the SST from DLC1 and then turn ignition switch ON.
SST 09843-18020




b. In case of using the LEXUS hand-held tester:
Check the input signal.

1. Turn the ignition switch OFF.
2. Set each of the check items in the table to the condition in Operation (A).
3. Hook up the LEXUS hand-held tester to the DLC3.
4. Turn the ignition switch ON.
5. Select the SIGNAL CHECK mode on the LEXUS hand-held tester.
6. Each of the check items is set to the condition in Operation (B).

HINT: Individual checking of each signal in step (5) can be performed.

7. Read the DTC by following prompts on the tester screen.

HINT: Please refer to the LEXUS hand-held tester operator's manual for further details.

C1781/81 - C1796/96:

3. DTC OF INPUT SIGNAL CHECK

4. DAMPING FORCE CONTROLLING CONDITION CHECK




a. Using SST, connect terminals Ts and E1 of DLC1.
SST 09843-18020

b. Turn the ignition switch ON.

HINT: In this condition, the damping force control actuator position becomes 1 position.

c. Starting from the above mentioned position, as the brake pedal is depressed, the damping force control actuator position increases (1 -> 2 -> 3 -> .....15 -> 16). At this time, bounce the vehicle and check that the shock absorber is becoming harder.

HINT:
- To hold the damping force control actuator at a specific position, adjust it to the position using the above mentioned procedure then increase the vehicle speed to over 5 km/h (3 mph).
- After that the damping force control actuator position does not change until the ignition switch is turned OFF.
- If the damping force control actuator does not operate, inspect the damping force control actuator circuit and suspension control ECU.

5. HEIGHT CONTROL OPERATION TEST (ACTIVE TEST)




a. Using SST, connect terminals Ts and E1 of DLC1.
SST 09843-18020




b. Push the "DOWN" button of the height select switch 5 times or more within 5 seconds after starting the engine.

HINT: At this time the height control OFF indicator light flashes at 0.25 second intervals.




c. By operating each switch in the given table, check the operation of the height control of each wheel.

NOTE: Do not raise the vehicle height higher than the "HI" position when raising it with the active test.