Toyota CH-R Service Manual: Terminals Of Ecu

Toyota CH-R Service Manual / Seat / Seat Heater System / Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for TMMT Made)

(a) Disconnect the air conditioning amplifier assembly connector.

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
F72-5 (IG+) - Body ground	B - Body ground	IG power supply	Ignition switch ON	11 to 14 V
F72-5 (IG+) - Body ground	B - Body ground	IG power supply	Ignition switch off	Below 1 V
F72-29 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F72-1 (B) - Body ground	V - Body ground	Battery power supply	Always	11 to 14 V

(d) Check for pulse generation according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
F72-3 (LIN1) - Body ground	L - Body ground	Seat heater switch signal	Ignition switch ON	Pulse generation

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for TMC Made)

(a) Disconnect the air conditioning amplifier assembly connector.

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
F139-2 (IG+) - Body ground	B - Body ground	IG power supply	Ignition switch ON	11 to 14 V
F139-2 (IG+) - Body ground	B - Body ground	IG power supply	Ignition switch off	Below 1 V
F139-4 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F139-1 (B) - Body ground	V - Body ground	Battery power supply	Always	11 to 14 V

(d) Check for pulse generation according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
F139-14 (LIN1) - Body ground	BE - Body ground	Seat heater switch signal	Ignition switch ON	Pulse generation

CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Disconnect the air conditioning control assembly connector.

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
F61-16 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F61-10 (IG+) - F61-16 (GND)	BE - W-B	IG power supply	Ignition switch ON	11 to 14 V
F61-10 (IG+) - F61-16 (GND)	BE - W-B	IG power supply	Ignition switch off	Below 1 V

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

(e) Check for pulse generation according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
F61-2 (LIN1) - F61-16 (GND)	L - W-B	Seat heater switch signal	Ignition switch ON	Pulse generation
F61-4 (RV) - F61-16 (GND)	SB - W-B	Seat heater switch volume signal	Ignition switch ON, seat heater switch (for front passenger side) off	Below 0.6 V
			Ignition switch ON, seat heater switch (for front passenger side) HI	3.9 to 5.5 V
			Ignition switch ON, seat heater switch (for front passenger side) MID	3.4 to 4.7 V
			Ignition switch ON, seat heater switch (for front passenger side) LO	2.5 to 3.5 V
F61-11 (SW) - F61-16 (GND)	R - W-B	Seat heater switch volume signal	Ignition switch ON, seat heater switch (for front passenger side) off	Below 1 V
F61-11 (SW) - F61-16 (GND)	R - W-B	Seat heater switch volume signal	Ignition switch ON, seat heater switch (for front passenger side) on	11 to 14 V
F61-6 (RV) - F61-16 (GND)	LG - W-B	Seat heater switch volume signal	Ignition switch ON, seat heater switch (for driver side) off	Below 0.6 V
			Ignition switch ON, seat heater switch (for driver side) HI	3.9 to 5.5 V
			Ignition switch ON, seat heater switch (for driver side) MID	3.4 to 4.7 V
			Ignition switch ON, seat heater switch (for driver side) LO	2.5 to 3.5 V
F61-12 (SW) - F61-16 (GND)	P - W-B	Seat heater switch volume signal	Ignition switch ON, seat heater switch (for driver side) off	Below 1 V
F61-12 (SW) - F61-16 (GND)	P - W-B	Seat heater switch volume signal	Ignition switch ON, seat heater switch (for driver side) on	11 to 14 V

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: If the battery voltage is low, the seat heater system may not operate. Refer to Data List for power steering system. Click here HINT: Use the table belo ...

DIAGNOSIS SYSTEM DESCRIPTION (a) Seat heater system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfun ...

Other materials:

Toyota CH-R Service Manual > Smart Key System(for Entry Function): Back Door Entry Lock and Unlock Functions do not Operate
DESCRIPTION If the entry lock and unlock functions do not operate for the back door only, the request code may not be being transmitted from the back door. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and electrical ...

Toyota CH-R Service Manual > Pre-collision System: Diagnosis System
DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here FUNCTION OF WARNING INDICATOR AND MESSAGE (a) If the pre-collision system is not functioning properly, the driver is warned by the PCS warning light and a warning message displayed on the multi-information display. War ...

Toyota CH-R Service Manual: Terminals Of Ecu

Problem Symptoms Table

Diagnosis System

Other materials:

Toyota C-HR (AX20) 2023-2026 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual