Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Terminals Of Ecu

TERMINALS OF ECU

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the I55 and I253 radio and display receiver assembly connectors.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I55-15 (IG) - Body ground

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

I55-16 (ACC1) - Body ground

Power source (ACC)

Ignition switch off

Below 1 V

Ignition switch ACC

10.5 to 16 V

I55-4 (+B1) - Body ground

Power source (+B)

Ignition switch off

10.5 to 16 V

I55-1 (GND1) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the I55 and I253 radio and display receiver assembly connectors.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I55-5 (REV) - Body ground

Reverse signal

Ignition switch ON, shift lever in R

11 to 14 V

Ignition switch ON, shift lever not in R

Below 1 V

I253-28 (V+) - I253-29 (V-)

Display signal

Ignition switch ON, shift lever in R

Pulse generation (See waveform 1)

Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

Pulse generation (See waveform 2)

I253-30 (CA+) - I253-27 (CGND)

Power source

Ignition switch ACC

5.5 to 7.05 V

I253-27 (CGND) - Body ground

Camera ground

Always

Below 1 Ω

I253-26 (CSLD) - Body ground

Shield ground

Always

Below 1 Ω

(e) Using an oscilloscope, check waveform 1.

Measurement Condition

Item

Content

Terminal No. (Symbol)

I253-28 (V+) - I253-29 (V-)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Ignition switch ON, shift lever in R

(f) Using an oscilloscope, check waveform 2.

Measurement Condition

Item

Content

Terminal No. (Symbol)

I253-28 (V+) - I253-29 (V-)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

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