Toyota Camry owners & service manuals

Toyota Camry (XV70): Parking Brake Switch Circuit

DESCRIPTION

This circuit is from the parking brake switch assembly*1 or skid control ECU (Brake Actuator Assembly)*2 to the radio and display receiver assembly.

  • *1: w/o Electric Parking Brake System

    *2: w/ Electric Parking Brake System

WIRING DIAGRAM

w/o Electric Parking Brake System w/ Electric Parking Brake System

PROCEDURE

1.

CHECK MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/o Electric Parking Brake System

A

w/ Electric Parking Brake System

B

B

GO TO STEP 4

A

2.

CHECK BRAKE WARNING LIGHT

(a) Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.

OK:

The brake warning light operates as specified above.

NG

GO TO BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS

OK

3.

CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the K2 radio and display receiver assembly connector.

(b) Disconnect the A4 parking brake switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-20 (PKB) - A4-1

Always

Below 1 Ω

K2-20 (PKB) or A4-1 - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK BRAKE WARNING LIGHT

(a) Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.

OK:

The brake warning light operates as specified above.

NG

GO TO BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS

OK

5.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the K2 radio and display receiver assembly connector.

(b) Disconnect the A34 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-20 (PKB) - A34-33 (PKB)

Always

Below 1 Ω

K2-20 (PKB) or A34-33 (PKB) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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