Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000017R100AX
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: TC and CG Terminal Circuit; 2007 MY LX470 [08/2006 -        ]

TC and CG Terminal Circuit

DESCRIPTION

DTC output mode is set by connecting terminal TC and CG of the DLC3. The DTCs are displayed by blinking the SRS warning light.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK SRS WARNING LIGHT

(a) Check operation of the SRS warning light after the ignition switch is turned from LOCK position to ON position.
NO

CHECK SRS WARNING LIGHT SYSTEM

YES

2.

CHECK VOLTAGE BETWEEN TERMINAL TC AND CG OF DLC3

(a) Turn the ignition switch to ON.

(b) Measure the voltage between terminal TC and CG of DLC3.

Standard voltage:

4 to 14 V
OK

GO TO STEP 5

NG

3.

CHECK VOLTAGE BETWEEN TERMINAL TC OF DLC3 AND BODY GROUND

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

Standard voltage:

4 to 14 V
OK

CHECK HARNESS BETWEEN TERMINAL CG OF DLC3 AND BODY GROUND

NG

4.

CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Turn the ignition switch to LOCK.

(b) Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.

(c) Disconnect the C32 center airbag sensor connector.

(d) Insert the service wire into terminal TC from back side as shown in the illustration.

(e) Connect the C32 center airbag sensor connector with service wire.

(f) Connect the negative (-) terminal cable to the battery.

(g) Turn the ignition switch to ON and wait at least for 20 seconds.

(h) Connect the service wire of terminal TC to body ground.

OK:

SRS warning light comes on.

NOTICE:

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

CHECK HARNESS BETWEEN THE AIRBAG SENSOR ASSEMBLY AND DLC3

NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

5.

CHECK RESISTANCE BETWEEN TERMINAL TC OF CENTER AIRBAG SENSOR ASSEMBLY AND BODY GROUND

(a) Turn the ignition switch to LOCK.

(b) Disconnect negative (-) terminal cable from the battery, and wait at least for 90 seconds.

(c) Disconnect the C32 center airbag sensor connector.

(d) Measure the resistance between terminal TC of the C32 center airbag sensor connector and body ground.

Standard resistance:

1 MΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY