Toyota Tacoma (2015-2018) Service Manual: Slip Indicator Light Remains ON

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Slip Indicator Light Remains ON

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

The slip indicator light blinks during VSC and/or TRAC operation.

If a malfunction is detected, the slip indicator light comes on to warn the driver (See page w/ Rear Differential Lock: ).

w/ Rear Differential Lock:

When the rear differential cannot be unlocked for 2 consecutive trips, the slip indicator light illuminates.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page ).
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
w/ Rear Differential Lock:
As there may be malfunctions in the differential system related to when the system operates with the rear differential locked, check the differential system first (See page ).

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output (See page Result Result ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

CHECK CAN COMMUNICATION SYSTEM

2.	CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.

OK:

The connector is securely connected.

CONNECT CONNECTOR TO ECU CORRECTLY

3.	INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

4.	CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

(a) Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S1-12 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*A	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

5.	CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

(a) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S1-25 (GND1) - Body ground	Always	Below 1 Ω

Text in Illustration

*A	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

6.	READ VALUE USING TECHSTREAM (SLIP INDICATOR LIGHT)

(a) Reconnect the S1 skid control ECU (brake actuator assembly) connector.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

(f) According to the display on the Techstream, read the Data List.

ABS/VSC/TRAC

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Slip Indicator Light	SLIP indicator light	OFF or ON	OFF: Indicator light off ON: Indicator light on	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Slip Indicator Light

SLIP indicator light

OFF or ON

OFF: Indicator light off

ON: Indicator light on

(g) Check the Techstream display condition of the slip indicator light.

Result

Result	Proceed to
Display of the Data List remains OFF	A
Display of the Data List remains ON	B

INSPECT METER / GAUGE SYSTEM

REPLACE BRAKE ACTUATOR ASSEMBLY

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