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 |
