Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Terminals Of Ecu

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Exterior / Window / Glass / Windshield Deicer System / Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the I49 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.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I49-6 (IG+) - I49-17 (GND)

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

I49-5 (B) - I49-17 (GND)

Power source (Back-up)

Always

11 to 14 V

I49-17 (GND) - Body ground

Ground for main power supply

Always

Below 1 Ω

(c) Reconnect the I49 air conditioning amplifier assembly connector.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I49-7 (LIN1) - I49-17 (GND)

LIN communication line

Ignition switch ON, front wiper deicer switch on

Pulse generation

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I49-22 (FDEF) - I49-17 (GND)

Wiper Deicer signal

Ignition switch ON, front wiper deicer switch off

11 to 14 V

Ignition switch ON, front wiper deicer switch on

Below 2.2 V

CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Disconnect the I37 air conditioning control assembly connector.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I37-9 (IG+) - I37-13 (GND)

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

I37-13 (GND) - Body ground

Ground for air conditioning control assembly

Always

Below 1 Ω

(c) Reconnect the I37 air conditioning control assembly connector.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I37-7 (LIN1) - I37-13 (GND)

LIN communication line

Ignition switch ON

Pulse generation

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I37-3 (DFAC) - I37-13 (GND)

Wiper Deicer signal

Ignition switch ON, front wiper deicer switch off

Below 1 V

Ignition switch ON, front wiper deicer switch on

11 to 14 V

I37-11 (IND) - I37-13 (GND)

Front wiper deicer switch indicator signal

Ignition switch ON, front wiper deicer switch off

11 to 14 V

Ignition switch ON, front wiper deicer switch on

Below 1 V

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