Toyota Venza: Terminals Of Ecu
TERMINALS OF ECU
1. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
(a) Disconnect the 2A, 2C and 2F main body ECU (driver side junction block assembly) connectors.
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(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.
|
Symbols (Terminal No.) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
2A-1 (IG) - Body ground |
B - Body ground |
Ignition power supply (IG signal) |
Engine switch on (IG) → off |
10 to 14 V → Below 1 V |
|
2A-1 (ACC) - Body ground |
B - Body ground |
Ignition power supply (ACC signal) |
Engine switch on (ACC) → off |
10 to 14 V → Below 1 V |
|
2C-30 (ALTB) - Body ground |
BR - Body ground |
+B (power system alternator system) power supply |
Always |
10 to 14 V |
|
2F-16 (GND1) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the 2A, 2C and 2F main body ECU (driver side junction block assembly) connectors.
(d) Measure the voltage according to the value(s) in the table below.
|
Symbols (Terminal No.) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
D50-24 (DCTY) - Body ground |
V - Body ground |
Driver side door courtesy light switch input |
Driver side door CLOSED (OFF) → OPEN (ON) |
Pulse generation → Below 1 V |
|
D49-21 (PCTY) - Body ground |
V - Body ground |
Passenger side courtesy light switch input |
Passenger side door CLOSED (OFF) → OPEN (ON) |
Pulse generation → Below 1 V |
|
D49-7 (RCTY) - Body ground |
GR - Body ground |
Rear courtesy light switch RH input |
Rear door RH CLOSED (OFF) → OPEN (ON) |
Pulse generation → Below 1 V |
|
2O-19 (LCTY) - Body ground |
R - Body ground |
Rear courtesy light switch LH input |
Rear door LH CLOSED (OFF) → OPEN (ON) |
Pulse generation → Below 1 V |
|
D49-25 (BCTY) - Body ground |
GR - Body ground |
Back door courtesy light switch input |
Back door CLOSED (OFF) → OPEN (ON) |
Pulse generation → Below 1 V |
|
D48-4 (HAZ) - Body ground |
G - Body ground |
Turn signal flasher relay signal |
Any transmitter switch is pressed → not pressed |
Below 1 V → 10 to 14 V |
|
2C-25 (HORN) - Body ground |
R - Body ground |
Vehicle horn siganal |
Vehicle horn is sounding (Panic alarm system is in alarm sounding state) |
Below 1 V → 12 V |
|
D51-7 (BZR) - Body ground |
LG - Body ground |
Wireless door lock buzzer signal |
Wireless door lock buzzer OFF → ON |
Below 1 V → Pulse generation |
If the result is not as specified, the main body ECU (driver side junction block assembly) may have a malfunction.
2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Disconnect the D25 and D26 certification ECU (smart key ECU assembly) connectors.
(b) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbols) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
D25-15 (E) - Body ground |
B - Body ground |
Ground |
Always |
Below 1 Ω |
|
D25-1 (+B) - D25-15 (E) |
G - B |
Battery power supply |
Always |
11 to 14 V |
|
D25-16 (IG) - D25-15 (E) |
R - B |
IG power supply |
Engine switch on (IG) |
11 to 14 V |
|
Engine switch off |
Below 1 V |
- If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the D25 and D26 certification ECU (smart key ECU assembly) connectors.
(d) Measure the voltage according to the value(s) in the table below.
|
Terminal No. (Symbols) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
D26-16 (RSSI) - D25-15 (E) |
P - B |
Door control receiver output signal |
Engine switch off, all doors closed and transmitter switch not pressed |
11 to 14 V |
|
Engine switch off, all doors closed and transmitter switch pressed |
Below 2 V |
|||
|
D26-15 (RDA) - D25-15 (E) |
R - B |
Door control receiver input signal |
Engine switch off, all doors closed and transmitter switch not pressed |
11 to 14 V pulse generation at regular intervals |
|
Engine switch off, all doors closed and transmitter switch pressed |
Pulse generation |
|||
|
D26-5 (RCO) - D25-15 (E) |
Y - B |
Supply battery to door control receiver |
Engine switch off, all doors closed and transmitter switch pressed |
4.5 to 5.5 V |
- If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.
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PROBLEM SYMPTOMS TABLE
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The ECU stores trouble codes when malfunctions occur.
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