Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER

(a) Disconnect the J19 air conditioning amplifier connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J19-1 (IG+) - J19-14 (GND)	B - W-B	Ignition power supply	Ignition switch ON	11 to 14 V
J19-1 (IG+) - J19-14 (GND)	B - W-B	Ignition power supply	Ignition switch OFF	Below 1 V
J19-21 (B) - J19-14 (GND)	GR - W-B	Battery power source	Always	11 to 14 V
J19-37 (LIN1) - J19-14 (GND)	SB - W-B	LIN communication signal	Ignition switch ON	Pulse generation
J19-14 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J19-40 (D) - J19-14 (GND)	LG - W-B	Deicer relay	Ignition switch ON, windshield deicer switch off	11 to 14 V
J19-40 (D) - J19-14 (GND)	LG - W-B	Deicer relay	Ignition switch ON, windshield deicer switch on	Below 1 V

2. CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Disconnect the J127 air conditioning control assembly connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J127-4 (IG+) - J127-5 (GND)	Y - W-B	Ignition power supply	Ignition switch ON	11 to 14 V
J127-4 (IG+) - J127-5 (GND)	Y - W-B	Ignition power supply	Ignition switch OFF	Below 1 V
J127-5 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
J127-7 (STX) - J127-5 (GND)	SB - W-B	LIN communication signal	Ignition switch ON	Pulse generation

Toyota Tundra Service Manual > Air Conditioning System(for Automatic Air Conditioning System): Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air conditioner / Trouble Codes. (e) Check for DTCs. 2. CLEAR DTC (a) Connect the Techstream to the DLC3. (b) Turn the ...

Toyota Tundra Owners Manual