Toyota Corolla Cross: Terminals Of Ecu
TERMINALS OF ECU
CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Remove the main body ECU (multiplex network body ECU).
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|
*1 | Power Distribution Box Assembly |
*2 | Main Body ECU (Multiplex Network Body ECU) |
(b) Reconnect the power distribution box assembly connectors.
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(c) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) | Terminal Description |
Condition | Specified Condition |
|---|---|---|---|
|
MB-13 (GND1) - Body ground |
Ground | Always |
Below 1 Ω |
|
MB-26 (BECU) - Body ground |
Auxiliary battery power supply |
Ignition switch off | 11 to 14 V |
|
MB-27 (IGR) - Body ground |
IG power supply | Ignition switch off |
Below 1 V |
|
Ignition switch ON | 11 to 14 V |
(d) Install the main body ECU (multiplex network body ECU).
Click here
(e) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) | Terminal Description |
Condition | Specified Condition |
|---|---|---|---|
|
8F-43 - Body ground |
Rear window defogger signal (output) |
Rear window defogger switch off |
Below 1 V |
|
Rear window defogger switch on |
11 to 14 V |
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 | ||
|
I49-17 (GND) - Body ground |
Ground for main power supply |
Always | Below 1 Ω |
(c) Reconnect the I49 air conditioning amplifier assembly connector.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) | Terminal Description |
Condition | Specified Condition |
|---|---|---|---|
|
I49-1 (CANL) - I49-2 (CANH) |
CAN communication system |
CAN communication is performed |
Pulse generation |
|
I49-7 (LIN1) - I49-17 (GND) |
LIN communication line |
Ignition switch ON | Pulse generation |
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.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
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 | 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 |
READ NEXT:
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a p
Rear Window Defogger System does not Operate
DESCRIPTION An operation request signal is sent to the air conditioning amplifier assembly via LIN communication when the rear window defogger switch (air conditioning control assembly) is operated. W
Windshield Deicer Switch
RemovalREMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 LOWER NO.1 INSTRUMENT PANEL FINISH PANEL
55432D -
- -
2 F
SEE MORE:
Check Bus 2 Line
DESCRIPTION
Symptom
Trouble Area
There are ECUs or sensors that display a communication stop on the bus
diagnostic screen. Or, there are ECUs or sensors that display communication
stop history on the "Detail" screen.
CAN main
Battery Cooling Filter
Removal
REMOVAL
CAUTION / NOTICE / HINT
COMPONENTS (REMOVAL)
Procedure
Part Name Code
1
BATTERY SERVICE HOLE COVER
-
-
-
-
2
NO. 1 HV BATTERY IN
