Toyota CH-R Service Manual: Stop Light Control Relay Malfunction (C1380)

Toyota CH-R Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Stop Light Control Relay Malfunction (C1380)

DESCRIPTION

When the dynamic radar cruise control system*1, pre-collision system*1 or brake hold control system operates, the skid control ECU outputs a stop light drive output (STPO) signal to illuminate the stop lights.

*1: w/ Pre-collision System

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1380

Stop Light Control Relay Malfunction

Either condition is met:

  • When the voltage at the +BS terminal is between 10 V or more and the stop light control relay drive output (STPO) is on, a signal is not input to the STP2 terminal for 5 seconds or more.
  • When the voltage at the +BS terminal is between 10 V or more and the stop light control relay drive output (STPO) is off, the signal at the STP terminal is different from the input signal at the STP2 terminal for 5 seconds or more.
  • Wire harness or connector
  • Stop light control relay (Stop light switch assembly)
  • Skid control ECU (brake actuator assembly)
DTC Detection Conditions: C1380
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

When the voltage at the +BS terminal is between 10 V or more and the stop light control relay drive output (STPO) is on, a signal is not input to the STP2 terminal.

○

-

When the voltage at the +BS terminal is between 10 V or more and the stop light control relay drive output (STPO) is off, the signal at the STP terminal is different from the input signal at the STP2 terminal.

-

○

Detection Time

5 seconds or more

5 seconds or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (STP, STPO AND STP2 TERMINAL)

(a) Turn the ignition switch off.

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

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Brake pedal depressed

11 to 14 V

Brake pedal released

Below 1.5 V

A42-10 (STPO) - Body ground

Always

11 to 14 V

A42-44 (STP2) - Body ground

Brake pedal depressed

11 to 14 V

Brake pedal released

Below 1.5 V

Result

Proceed to

All terminal voltage is normal

A

Only STP terminal voltage abnormal

B

Only STPO terminal voltage abnormal

C

Only STP2 terminal voltage abnormal

D

STPO terminal and STP2 terminal voltage abnormal

E
B

GO TO STEP 5

C

GO TO STEP 13

D

GO TO STEP 14

E

GO TO STEP 18

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)

(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

(b) Perform "Active Test" according to the display on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Stop Light Relay

Stop light control relay (Stop light switch assembly)

ON or OFF

Stop lights come on
Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Stop Light Relay

OK:

Stop light turns ON/OFF in response to the Techstream operation

NG

GO TO STEP 4

OK

3.

CHECK FOR DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

(c) Perform "Active Test" according to the display on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Stop Light Relay

Stop light control relay (Stop light switch assembly)

ON or OFF

Stop lights come on
Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Stop Light Relay

(d) Check for DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

Result

Proceed to

DTC C1380 is output.

A

DTC C1380 is not output.

B
A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

USE SIMULATION METHOD TO CHECK

4.

INSPECT BRAKE ACTUATOR ASSEMBLY

(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

(b) Perform "Active Test" according to the display on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Stop Light Relay

Stop light control relay (Stop light switch assembly)

ON or OFF

Stop lights come on
Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Stop Light Relay

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A45-4 (ACC) - Body ground

Active Test is ON

Below 1.5 V

*a

Component with harness connected

(Stop Light Switch Assembly)
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

5.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A38 ECM connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

11 to 14 V*

A42-42 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V

HINT:

*: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

Result

Proceed to

OK

A

NG (w/ Smart Key System)

B

NG (w/o Smart Key System)

C
A

REPLACE ECM

C

GO TO STEP 10

B

6.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SMART KEY ECU ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

11 to 14 V*

A42-42 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V

HINT:

*: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

OK

REPLACE SMART KEY ECU ASSEMBLY

NG

7.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the F19 shift lock control ECU (shift lock control unit assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

11 to 14 V*

A42-42 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V

HINT:

*: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

OK

REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY

NG

8.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A45 stop light switch assembly connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - A45-3 (L)

Always

Below 1 Ω

A42-42 (STP) or A45-3 (L) - Body ground

Always

10 kΩ or higher
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the F18 shift lock control ECU (shift lock control unit assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

11 to 14 V*

A42-42 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V

HINT:

*: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

OK

REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY

NG

11.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A45 stop light switch assembly connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-42 (STP) - A45-3 (L)

Always

Below 1 Ω

A42-42 (STP) or A45-3 (L) - Body ground

Always

10 kΩ or higher
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A45 stop light switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-10 (STPO) - A45-4 (ACC)

Always

Below 1 Ω
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH)

(a) Turn the ignition switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the M48 rear combination light assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-44 (STP2) - Body ground

Brake pedal depressed

11 to 14 V

A42-44 (STP2) - Body ground

Brake pedal released

Below 1.5 V

Reult

Proceed to

OK (for LED Type)

A

OK (for Bulb Type)

B

NG

C
A

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

B

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

C

15.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH)

(a) Turn the ignition switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the M48 rear combination light assembly LH connector.

(d) Disconnect the M47 rear combination light assembly RH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-44 (STP2) - Body ground

Brake pedal depressed

11 to 14 V

A42-44 (STP2) - Body ground

Brake pedal released

Below 1.5 V

Result

Proceed to

OK (for LED Type)

A

OK (for Bulb Type)

B

NG

C
A

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

B

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

C

16.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - CENTER STOP LIGHT ASSEMBLY)

(a) Turn the ignition switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the M48 rear combination light assembly LH connector.

(d) Disconnect the M47 rear combination light assembly RH connector.

(e) Disconnect the c1 center stop light assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-44 (STP2) - Body ground

Brake pedal depressed

11 to 14 V

A42-44 (STP2) - Body ground

Brake pedal released

Below 1.5 V
OK

REPLACE CENTER STOP LIGHT ASSEMBLY

NG

17.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the M48 rear combination light assembly LH connector.

(d) Disconnect the M47 rear combination light assembly RH connector.

(e) Disconnect the c1 center stop light assembly connector.

(f) Disconnect the A45 stop light switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A45-1 (OUT) - A42-44 (STP2)

Always

Below 1 Ω

A45-1 (OUT) or A42-44 (STP2) - Body ground

Always

10 kΩ or higher
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

18.

CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT

(a) Turn the ignition switch off.

(b) Disconnect the stop light switch assembly connector.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A45-2 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A45-7 (B) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

19.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A45 stop light switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-10 (STPO) - A45-4 (ACC)

Always

Below 1 Ω
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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