Without Scan Tool

SRS Warning Light Check:

1. SRS WARNING LIGHT CHECK
a. Turn the ignition switch to ACC or ON and check that the SRS warning light lights up.
b. Check that the SRS warning light goes out after approx. 6 seconds.

HINT:
^ When the ignition switch is at ACC or ON and the SRS warning light remains on or flashes, the airbag sensor assembly has detected a malfunction code.
^ If, after approx. 6 seconds have elapsed, the SRS warning light sometimes lights up or the SRS warning light lights up even when the ignition switch is OFF, a short in the SRS warning light circuit can be considered likely. Proceed to "SRS warning light circuit malfunction".

DTC Check (Using Diagnosis Check Wire):

2. DTC CHECK (Using diagnosis check wire)
a. OUTPUT DTC
1. Turn the ignition switch to the ACC or ON position and wait approx. 20 seconds.
2. Using SST connect terminals Tc and E1 of the DLC1.
SST 09843-18020

NOTICE: Never make a mistake with the terminal connecting position as this will cause a malfunction.

HINT: DTC check and troubleshooting of each DTC can also be done using DLC2.

DTC Check (Using Diagnosis Check Wire):

b. READ DTC
Read the 2-digit DTC as indicated by the number of times the SRS warning light blinks. As an example, the blinking patterns, normal, 11 and 31 are as shown on the illustration.
^ Normal code indication
The light will blink 2 times per second.
^ Malfunction code indication
The first blinking output indicates the first digit of a 2-digit DTC. After a 1.5 second pause, the second blinking output will indicate the second digit.

DTC Check (Using Diagnosis Check Wire):

If there are 2 or more codes, there will be a 2.5 second pause between each code. After all the codes have been output, there will be a 4.0 second pause and they will all be repeated.

HINT
^ In the event of a number of trouble codes, indication will start from the smallest numbered code.
^ If it does not output a DTC or outputs a DTC without terminal connection, proceed to the Tc terminal circuit inspection.

DTC Check (Using Diagnosis Check Wire):

3. DTC check (Using LEXUS hand-held tester)
a. Hook up the LEXUS hand-held tester to the DLC1 or DLC2.
b. 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.

4. DTC clearance
When the ignition switch is turned off, the DTC is cleared.

Release Method Of Airbag Activation Prevention Mechanism:

5. RELEASE METHOD OF AIRBAG ACTIVATION PREVENTION MECHANISM
An airbag activation prevention mechanism is built into the connector for the squib circuit of the SRS. When release of the airbag activation prevention mechanism is directed in the troubleshooting procedure, as shown in the illustration of the connectors "1" and "3" below, insert paper which is the same thickness as the male terminal, between the terminal and the short spring.

CAUTION: NEVER RELEASE the airbag activation prevention mechanism on the steering wheel pad connector.

NOTICE:
^ Do not release the airbag activation prevention mechanism unless specifically directed by the trouble- shooting procedure.
^ If the paper inserted is too thick the terminal and short spring may be damaged, so always use paper the same thickness as the male terminal.