Terminals Of Ecu

AIR CONDITIONING AMPLIFIER ASSEMBLY

Disconnect the connectors from the A/C amplifier assembly and inspect the connector on the wire harness side, as shown the chart.

Fig 1: Disconnecting Connector From A/C Amplifier Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage and Resistance

RESISTANCE SPECIFICATIONS

Terminals No (Symbols)	Wiring Color	Condition	Specified condition
A10-11 (GND) - Body Ground	W-B - Body ground	Always	Below 1 Ω
A11-5 (TE) - A11-12 (SG-1)	LG-P	Evaporator temp.: 25°C (77°F)	1.5 kΩ
A10-2 (IG) - Body Ground	BR - Body ground	Ignition switch: ON	10 to 14 V
A10-2 (IG) - Body Ground	BR - Body ground	Ignition switch: LOCK or ACC	Below 1 V
A10-12 (+B) - Body Ground	W - Body ground	Always	10 to 14 V
A10-13 (ACC) - Body Ground	GR - Body ground	Ignition switch: ACC	10 to 14 V
A10-13 (ACC) - Body Ground	GR - Body ground	Ignition switch: except ACC	Below 1 V

If the circuit is as specified, try to replace the A/C amplifier assembly with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.

Connect the connector to A/C amplifier assembly and inspect the wire harness side connector from the back side, as shown in the chart.

Fig 2: Identifying A/C Amplifier Assembly Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TERMINAL SYMBOLS REFERENCE AND SPECIFIED CONDITION

Terminals No (Symbols)

Wiring Color

Condition

Specified condition

A10-4 (MR/F) - Body Ground

Y - Body ground

Ignition switch: ON

10 to 14 V

A10-4 (MR/F) - Body Ground

Y - Body ground

Ignition switch: OFF

Below 1 V

A10-5 (AIR) - Body Ground

B - Body ground

Ignition switch: ON
R/F switch: RECIRCULATION

10 to 14 V

A10-5 (AIR) - Body Ground

B - Body ground

Ignition switch: ON
R/F switch: FRESH

Below 1 V

A10-6 (AIF) - Body Ground

W - Body ground

Ignition switch: ON
R/F switch: RECIRCULATION

Below 1 V

A10-6 (AIF) - Body Ground

W - Body ground

Ignition switch: ON
R/F switch: FRESH

10 to 14 V

A10-7 (HR) - Body Ground

O - Body ground

Ignition switch: ON
Blower switch: ON

Below 1 V

A10-7 (HR) - Body Ground

O - Body ground

Ignition switch: ON
Blower switch: OFF

10 to 14 V

A10-9 (MPX-) - A11-2 (MPX+)

G - Y

Multiplex communication circuit

Pulse generation

(⁽¹⁾) (⁽²⁾) A10-15 (ILL+) - A10-21 (ILL-)

V - Y

Light switch: TAIL or HEAD

10 to 14 V

A11-6 (TPO) - A11-1 (SG-4)

R - B

Ignition switch: ON
Mode switch: DEF

0.5 to 1.5 V

A11-6 (TPO) - A11-1 (SG-4)

R - B

Ignition switch: ON
Mode switch: FACE

3.5 to 4.5 V

A11-7 (AOD) - Body Ground

G - Body ground

Ignition switch: ON
Mode switch: DEF

10 to 14 V

A11-7 (AOD) - Body Ground

G - Body ground

Ignition switch: ON
Mode switch: FACE

Below 1 V

A11-8 (AOF) - Body Ground

V - Body ground

Ignition switch: ON
Mode switch: DEF

Below 1 V

A11-8 (AOF) - Body Ground

V - Body ground

Ignition switch: ON
Mode switch: FACE

10 to 14 V

A11-9 (S5-4) - A11-1 (SG-4)

BR - B

Ignition switch: ON

4.5 to 5.5 V

A11-10 (TP) - A11-12 (SG-1)

SB - P

Ignition switch: ON
Set temperature: MAX. HOT

0.5 to 1.5 V

A11-10 (TP) - A11-12 (SG-1)

SB - P

Ignition switch: ON
Set temperature: MAX. COOL

3.5 to 4.5 V

A11-11 (S5-1) -A11-12 (SG-1)

O - P

Ignition switch: ON

4.5 to 5.5 V

A11-13 (AMC) - Body ground

GR - Body ground

Ignition switch: ON
Set temperature: MAX. HOT

Below 1 V

A11-13 (AMC) - Body ground

GR - Body ground

Ignition switch: ON
Set temperature: MAX. COOL

10 to 14 V

A11-14 (AMH) - Body ground

B - Body ground

Ignition switch: ON
Set temperature: MAX. HOT

10 to 14 V

A11-14 (AMH) - Body ground

B - Body ground

Ignition switch: ON
Set temperature: MAX. COOL

Below 1 V

⁽¹⁾	If the circuit is not as specified, try to replace the A/C amplifier assembly with a new one. If the circuit is as specified, inspect the circuits connected to other parts.

⁽²⁾	w/o Navigation system.