Replace Instrument Panel Junction Block Assembly

Parking Brake Switch Circuit

DESCRIPTION

The main body ECU receives a parking brake switch signal to control the daytime running light system. WIRING DIAGRAM

Main Body ECU

1: with Lever Type *2: with Pedal Type

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

MAIN BODY (MAIN BODY ECU):

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch and turn the intelligent tester main switch on.

(c) Select the item below in the DATA LIST, and read the display on the intelligent tester.

MAIN BODY (MAIN BODY ECU):

Item

Measurement Item/ Display (Range)

Normal Condition

Diagnostic Note

PARKING BRAKE SW

Parking brake SW signal / ON or OFF

ON: Parking brake switch is ON OFF: Parking brake switch is OFF

-

Normal conditions listed above are displayed. ├ľK>

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

INSPECT PARKING BRAKE SWITCH ASSEMBLY

(a) Remove the parking brake switch assembly.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection

Condition

Specified Condition

1 - Switch body

Shaft is pushed in

10 kQ or higher

1 - Switch body

Shaft is not pushed in

Below 1 Q

REPLACE PARKING BRAKE SWITCH ASSEMBLY

CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Result

Condition

Proceed to

with Pedal Type Parking Brake

A

with Lever Type Parking Brake

Go to step 5

CHECK HARNESS AND CONNECTOR (SWITCH - INSTRUMENT PANEL J/B ASSEMBLY)

Yaris Disconnect Instrument Panel

(a) Disconnect the IC instrument panel J/B assembly connector.

(b) Disconnect the A18 switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection

Condition

Specified Condition

IC-14 - A18-1

Always

Below 1 Q

IC-14 - Body ground

Always

10 kQ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

CHECK HARNESS AND CONNECTOR (SWITCH - INSTRUMENT PANEL J/B ASSEMBLY)

Wire Harness Side:

Instrument Panel J/B Assembly

Parking Brake Switch dJ

nc in

(a) Disconnect the IM instrument panel J/B assembly connector.

(b) Disconnect the E33 switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection

Condition

Specified Condition

IM-2 - E33-1

Always

Below 1 Q

IM-2 - Body ground

Always

10 kQ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Taillight Relay Circuit

DESCRIPTION

The main body ECU receives a light control switch TAIL signal from the headlight dimmer switch assembly, and turns the taillight relay on.

WIRING DIAGRAM

FL MAIN

Battery

Instrument Panel J/B

Turn Signal and Parking Light (Front LH)

Parking

Side Marker Light (Front LH)

Turn Signal and Parking Light (Front RH)

Parking

Side Marker Light (Front RH)

Rear Combination Light (LH)

Tail

14 ID

TAIL

TAIL

Main Body ECU -7-

TRLY

E121493E02

INSPECTION PROCEDURE

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