Lexus ES manuals

Lexus ES: Brake Switch "A" Signal Compare Failure (P057162)

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly outputs a signal to the hybrid vehicle control ECU. The hybrid vehicle control ECU uses this signal to control cancellation of vehicle speed by the dynamic radar cruise control. When the hybrid vehicle control ECU determines that terminals STP and ST1 of the stop light switch assembly are both less than 1 V, DTC P057162 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

P057162

Brake Switch "A" Signal Compare Failure

When the power switch is on (IG) and the dynamic radar cruise control system is operating, the hybrid vehicle control ECU detects that the voltage at terminal STP and ST1- are both less than 1 V for approximately 0.5 seconds or more.

  • Harness or connector
  • Stop light switch assembly
  • Hybrid vehicle control ECU

Does not come on

Hybrid Control

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the hybrid vehicle control ECU, refer to Registration.

    Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

(a) Disconnect the A80 stop light switch assembly connector.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A80-2 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A80-7 (B) - Body ground

Always

11 to 14 V

A80-6 (B) - Body ground

Power switch on (IG)

11 to 14 V

A80-6 (B) - Body ground

Power switch off

Below 1 V

(d) Connect the A80 stop light switch assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly.

Click here

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the A32 and A33 hybrid vehicle control ECU connectors.

(b) Disconnect the A80 stop light switch assembly connector.

(c) Disconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

(d) Disconnect the N9 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A33-28 (ST1-) - A80-5 (L)

Always

Below 1 Ω

A32-15 (STP) - A80-3 (L)

Always

Below 1 Ω

A33-28 (ST1-) or A80-5 (L) - Body ground

Always

10 kΩ or higher

A32-15 (STP) or A80-3 (L) - Body ground

Always

10 kΩ or higher

(f) Connect the N9 certification ECU (smart key ECU assembly) connector.

(g) Connect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

(h) Connect the A80 stop light switch assembly connector.

(i) Connect the A32 and A33 hybrid vehicle control ECU connectors.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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