Toyota Tacoma (2015-2018) Service Manual: Tire Pressure Warning Light Circuit

Toyota Tacoma (2015-2018) Service Manual / Tire And Wheel / Tire Pressure Warning System / Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning ECU and receiver detects any problems, the tire pressure warning light blinks for 1 minute then illuminates, and tire pressure monitoring is disabled at the same time. At this time, the ECU stores a DTC in memory.

Connecting terminals TC and CG of the DLC3 makes the tire pressure warning light blink to output DTCs. The tire pressure warning ECU and receiver sends the tire pressure warning light illumination request signal to the main body ECU (multiplex network body ECU) via a direct line. The main body ECU (multiplex network body ECU) then sends the signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
It is necessary to perform initialization (See page ) after registration (See page ) of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

1.	CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

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

Result

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK DTC OUTPUT (B1247)

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(d) Check for DTCs (See page OK: ).

OK:

DTC B1247 is not output.

GO TO DTC (B1247)

3.	CHECK OPERATION OF TIRE PRESSURE WARNING LIGHT (ACTIVETEST)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(f) Check the condition of the tire pressure warning light using the Techstream.

Combination Meter

Tester Display	Measurement Item	Control Range	Diagnostic Note
Indicat. Tire Pressure Warning System	Tire pressure warning light	OFF or ON	Confirm that the vehicle is stopped with the engine idling.

OK:

The tire pressure warning light turns on or off in accordance with the Techstream operation.

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

GO TO METER / GAUGE SYSTEM

TC and CG Terminal Circuit

DESCRIPTION Tire pressure warning system DTCs can be checked by connecting terminals 13 (TC) and 4 (CG) of the DLC3. The DTCs are indicated by blinking the tire pressure warning light. WIRING DI ...

Tire Position Not Identified

DESCRIPTION The tire pressure warning ECU and receiver identifies the tire position for each tire pressure warning valve and transmitter according to the wheel speed signals from the skid control ...

Other materials:

Interior Light Circuit
DESCRIPTION The illuminated entry system controls the interior lights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following inspection procedure. If the main body ECU (multiplex network body ECU) i ...

System Diagram
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Door Unlock Detection Switch Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page ).*1 *1: w/ Smart K ...