Terminals Of Ecu [04/2018 - 08/2019]

WARNING: This page is about a different variant/trim than selected.

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

Disconnect the K11 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
K11-1 (IG) - K11-12 (GND)	B - BR1 B - W-B2	IG power source	Power switch on (IG)	10 to 16 V
K11-7 (+B) - K11-12 (GND)	LA-R - BR1 LA-R - W-B2	Power supply (from auxiliary battery)	Always	10 to 16 V
K11-9 (CANH) - K11-10 (CANL)	L - W	CAN communication line	Power switch off	54 to 69 Ω
K11-12 (GND) - Body ground	BR - Body ground1 W-B - Body ground2	Ground	Always	Below 1 Ω

*1: Before Oct. 2018 Production
*2: From Oct. 2018 Production

Connect the K11 tire pressure warning ECU and receiver connector.

Measure the voltage according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.

HINT:

Measure the values on the wire harness side while the connector is connected.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component with harness connected
(Tire Pressure Warning ECU and Receiver)

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
K11-3 (CLSW) - K11-12 (GND)	SB - BR1 SB - W-B2	Tire pressure warning reset switch	Power switch on (IG) Steering pad switch assembly operated, "Set Pressure" selected on the multi-information display and "OK" switch (steering pad switch assembly) pressed and held	Below 1.5 V
K11-3 (CLSW) - K11-12 (GND)	SB - BR1 SB - W-B2	Tire pressure warning reset switch	Power switch on (IG) "OK" switch (steering pad switch assembly) off	8 to 15 V
K11-4 (RDA) - K11-12 (GND)	GR - BR1 GR - W-B2	Output signals	Power switch on (IG)	Pulse generation (see waveform 1)
K11-5 (PRG) - K11-12 (GND)	R - BR1 R - W-B2	Input signals	Power switch on (IG)	Pulse generation (see waveform 1)

*1: Before Oct. 2018 Production
*2: From Oct. 2018 Production

Using an oscilloscope, check waveform 1.

Fig 1: Waveform 1

*a	Example
*b	GND

WAVEFORM 1:

Item	Contents
Terminal	K11-4 (RDA) - K11-12 (GND) K11-5 (PRG) - K11-12 (GND)
Tool setting	5 V/DIV, 5 ms./DIV.
Vehicle condition	Power switch on (IG)

HINT:

The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.