Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001BTP007X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: Brake Warning Light Circuit; 2007 MY LX470 [08/2006 -        ]

Brake Warning Light Circuit

DESCRIPTION

The BRAKE warning light lights up while the brake fluid is insufficient and EBD is abnormal.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK PARKING BRAKE SWITCH CIRCUIT

(a) Check the parking brake switch circuit 2007 MY LX470 [08/2006 -        ]; PARKING BRAKE: PARKING BRAKE ASSEMBLY: INSPECTION+ .

NG

REPAIR OR REPLACE PARKING BRAKE SWITCH CIRCUIT

OK

2.

CHECK BRAKE FLUID LEVEL WARNING SWITCH CIRCUIT

(a) Check the brake fluid level warning switch circuit 2007 MY LX470 [08/2006 -        ]; BRAKE: HYDRAULIC BRAKE BOOSTER: DISASSEMBLY+ .

NG

REPAIR OR REPLACE BRAKE FLUID LEVEL WARNING SWITCH CIRCUIT

OK

3.

CHECK DTC FOR ABS
OK

REPAIR CIRCUIT INDICATED BY OUTPUT CODE

NG

4.

CHECK BRAKE WARNING LIGHT

(a) Check the warning light other than the BRAKE warning light.

OK

GO TO STEP 6

NG

5.

INSPECT RELAY (Marking: IG1 NO.2)

(a) Remove the IG1 NO. 2 relay from the cowl side junction block LH.

(b) Measure the resistance of the relay.

Standard resistance:

Tester Connection

Specified Condition

1 - 2

10 kΩ or higher

1 - 2

Below 1 Ω

(when battery voltage is applied to terminal 3 and 4)
NG

REPLACE RELAY

OK

CHECK COMBINATION METER (COMBINATION METER CIRCUIT)

6.

INSPECT ECU CONNECTORS

(a) Check that each ECU connector is properly installed.

OK:

Each ECU connector is properly installed.

NG

CONNECT CONNECTOR TO ECU CORRECTLY

OK

7.

CHECK WARNING LIGHT

(a) Check for open circuit in the combination meter circuit.

NG

REPLACE COMBINATION METER

OK

8.

CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - COMBINATION METER)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE SKID CONTROL ECU ASSEMBLY