Lexus NX: Open or Short Circuit in Lock Switch Circuit (C13A3,C13AB)

Lexus NX Service Manual / Brake / Parking Brake / Electric Parking Brake System / Open or Short Circuit in Lock Switch Circuit (C13A3,C13AB)

DESCRIPTION

When the electric parking brake switch (integration control and panel assembly) is pulled to the lock side, a lock request signal is output to the parking brake ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A3

Open or Short Circuit in Lock Switch Circuit

All of following conditions are met:

  • Power switch on (IG) or electric parking brake switch (integration control and panel assembly) pulled to lock side with power switch off.
  • Terminal LCK1 voltage is less than 2.3 V or more than 4.35 V; or terminal LCK2 voltage is less than 1.5 V* or more than 9.4 V*
  • Problem occurs for approx. 1 sec.

HINT:

*: When auxiliary battery voltage is 12 V

  • Electric parking brake switch (Integration control and panel assembly)
  • Wire harness or connector
  • Parking brake ECU assembly

Yes

An electric parking brake system malfunction is displayed on the multi-information display.

C13AB

Lock Switch Circuit Comparison

Both of following conditions are met:

  • Power switch on (IG) or electric parking brake switch (integration control and panel assembly) pulled to lock side with power switch off.
  • ON/OFF judgment of lock switch 1 and lock switch 2 does not match for approx. 1 sec.
  • Electric parking brake switch (Integration control and panel assembly)
  • Wire harness or connector
  • Parking brake ECU assembly

Yes

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
  • When the electric parking brake switch (integration control and panel assembly) is pulled and held for 1 second or more without being pulled fully to the lock side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).
  • When replacing the parking brake ECU assembly, operate the electric parking brake switch (integration control and panel assembly), as the parking brake indicator light (red) blinks when the power switch is first turned on (IG).

PROCEDURE

1.

INSPECT ELECTRIC PARKING BRAKE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Remove the electric parking brake switch (integration control and panel assembly).

Click here

(b) Inspect the electric parking brake switch (integration control and panel assembly).

Click here

NG

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY))

(a) Disconnect the I35 electric parking brake switch (integration control and panel assembly) connector.

(b) Disconnect the Q24 parking brake ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Q24-20 (LCK1) - I35-9 (LOK1)

Always

Below 5 Ω

Q24-15 (LCK2) - I35-10 (LOK2)

Always

Below 5 Ω

Q24-20 (LCK1) or I35-9 (LOK1) - Body ground

Always

10 kΩ or higher

Q24-15 (LCK2) or I35-10 (LOK2) - Body ground

Always

10 kΩ or higher

I35-16 (GND1) - Body ground

Always

Below 5 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (IG).

(d) Perform a lock operation with the electric parking brake switch (integration control and panel assembly).

HINT:

When the electric parking brake switch (integration control and panel assembly) is pulled and held for 1 second or more without being pulled fully to the lock side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).

(e) Check for DTCs.

Click here

Chassis > Electric Parking Brake > Trouble Codes
DTC is output

REPLACE PARKING BRAKE ECU ASSEMBLY

DTC is not output

USE SIMULATION METHOD TO CHECK

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