Terminals Of Ecu

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

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

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D37-38 (RDEF) - D37-14 (GND)	W - W-B	Rear defogger signal	Ignition switch on (IG), Rear window defogger switch OFF	11 to 14 V
D37-38 (RDEF) - D37-14 (GND)	W - W-B	Rear defogger signal	Ignition switch on (IG), Rear window defogger switch ON	Below 1 V
D37-1 (IG+) - D37-14 (GND)	GR - W-B	Power source (IG)	Ignition switch on (IG)	11 to 14 V
D37-1 (IG+) - D37-14 (GND)	GR - W-B	Power source (IG)	Ignition switch off	Below 1 V
D37-21 (B) - D37-14 (GND)	B - W-B	Power source (Back-up)	Always	11 to 14 V

Fig 1: Identifying Air Conditioning Amplifier Assembly Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D37-14 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness or amplifier.

Fig 2: Identifying Air Conditioning Control Assembly Terminals