Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / Seat / Seat Heater System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the A36 air conditioning amplifier assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
A36-17 (B) - Body ground	LG - Body ground	Air conditioning amplifier power supply	Always	11 to 14 V
A36-1 (IG+) - Body ground	GR - Body ground	Air conditioning amplifier power supply	Ignition switch ON	11 to 14 V
A36-10 (GND) - Body ground	W-B - Body ground	Air conditioning amplifier ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Measure the voltage and resistance 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
A35-24 (SHP+) - Body ground	SB - Body ground	Seat heater (for Front Passenger Side) drive signal	Ignition switch ON Seat heater switch (for Front Passenger Side) on	Below 1 V
A35-23 (SHD+) - Body ground	R - Body ground	Seat heater (for Driver Side) drive signal	Ignition switch ON Seat heater switch (for Driver Side) on	Below 1 V
A36-11 (LIN1) - Body ground	SB - Body ground	Seat heater switch signal	Ignition switch ON	Pulse generation
A36-31 (TSR) - A35-15 (SG-2)	BE - P	Seat heater sensor (for Front Passenger Side) input signal	Ignition switch off (25°C [77°F])	10 kΩ
A36-32 (TSL) - A35-15 (SG-2)	V - P	Seat heater sensor (for Driver Side) input signal	Ignition switch off (25°C [77°F])	10 kΩ

2. CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Check the air conditioning control assembly (See page Data List / Active Test ).

Problem Symptoms Table

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