Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for TMMT Made)

(a) Disconnect the F72 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

Switch Condition

Specified Condition

F72-5 (IG+) - F72-29 (GND)

B - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

F72-1 (B) - F72-29 (GND)

V - W-B

Battery power supply

Always

11 to 14 V

F72-29 (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.

(c) Reconnect the F72 air conditioning amplifier assembly connector.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Switch Condition

Specified Condition

F72-26 (RDFG) - F72-29 (GND)

P - W-B

Rear window defogger signal

Ignition switch ON, rear window defogger switch off

11 to 14 V

Ignition switch ON, rear window defogger switch on

Below 1 V

F72-3 (LIN1) - F72-29 (GND)

L - W-B

LIN communication line

Ignition switch ON

Pulse generation

If the result is not as specified, the air conditioning amplifier assembly may be malfunctioning.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for TMC Made)

(a) Disconnect the F139 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

Switch Condition

Specified Condition

F139-2 (IG+) - F139-4 (GND)

B - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

F139-1 (B) - F139-4 (GND)

V - W-B

Battery power supply

Always

11 to 14 V

F139-4 (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.

(c) Reconnect the F139 air conditioning amplifier assembly connector.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Switch Condition

Specified Condition

F139-5 (RDFG) - F139-4 (GND)

P - W-B

Rear window defogger signal

Ignition switch ON, rear window defogger switch off

11 to 14 V

Ignition switch ON, rear window defogger switch on

Below 1 V

F139-14 (LIN1) - F139-4 (GND)

BE - W-B

LIN communication line

Ignition switch ON

Pulse generation

If the result is not as specified, the air conditioning amplifier assembly may be malfunctioning.

CHECK AIR CONDITIONING CONTROL ASSEMBLY

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

Tester Connection

Wiring Color

Terminal Description

Switch Condition

Specified Condition

F61-2 (LIN1) - F61-16 (GND)

L - W-B*1

BE - W-B*2

LIN communication line

Ignition switch ON

Pulse generation

  • *1: for TMMT Made
  • *2: for TMC Made

If the result is not as specified, the air conditioning control assembly may be malfunctioning.

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