Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

If the DTC is not displayed, do the following troubleshooting.

Does SRS warning light up for approx. 6 seconds?
CHECK:

Check operation of the SRS warning light after ignition switch is turned from LOCK position to ON position.

Fig 1: Checking Operation Of SRS Warning Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NO: Check SRS warning light system. (See SRS WARNING LIGHT CIRCUIT MALFUNCTION )
2. YES: Go to next step
Check voltage between terminal TC and CG of DLC3.
PREPARATION:

Turn the ignition switch to ON.

CHECK:

Measure the voltage between terminal TC and CG of DLC3.

OK:
1. Voltage: 4- 14 V
Fig 2: Checking Voltage Between Terminals Tc And Cg Of DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Go to step 4
2. NG: Go to Next Step.
Check voltage between terminal TC of DLC3 and body ground.
CHECK:

Measure the voltage between the body ground and terminal of DLC3.TC

OK:
1. Voltage: 4- 14 V
Fig 3: Measuring Voltage Between Body Ground And Terminal Of DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Check harness between terminal CG of DLC3 and body ground.
2. NG: Go to Next Step.
Check airbag sensor assembly.
PREPARATION:
1. Turn the ignition switch to LOCK.
2. Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.
3. Disconnect the airbag sensor assembly connector.
4. Insert the service wire into terminal TC from back side as shown in the illustration.
5. Connect the airbag sensor assembly connector with service wire.
6. Connect the negative (-) terminal cable to the battery.
7. Turn the ignition switch to ON and wait at least for 20 seconds.
8. Connect the service wire of terminal TC to body ground.
CHECK:

Check operation of SRS warning light.

OK:

SRS waning light comes on.

NOTE: Pay due attention to the terminal connecting position to avoid a malfunction.

Fig 4: Connecting Service Wire Of Terminal TC To Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Check harness between the airbag sensor assembly and DLC3.
2. NG: Replace airbag sensor assembly.

If the DTC is displayed without a DTC check procedure, perform the following troubleshooting.

Check resistance between terminal TC of airbag sensor assembly and body ground.
PREPARATION:
1. Turn the ignition switch to LOCK.
2. Disconnect negative (-) terminal cable from the battery, and wait at least for 90 seconds.
3. Disconnect the airbag sensor assembly connector.
CHECK:

Check resistance between terminal TC of the airbag sensor assembly connector and body ground.

OK:
1. Resistance: 1 MΩ or Higher
Fig 5: Checking Resistance Between Terminal TC Of Airbag Sensor Assembly Connector And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Replace airbag sensor assembly.