TERMINALS OF ECU
1. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
(a) Disconnect the main body ECU (driver side junction block assembly) connectors.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
D49-7 (RCTY) - Body ground |
GR - Body ground |
Rear courtesy light switch RH input |
Rear door RH closed (OFF) → open (ON) |
10 kΩ or higher → Below 1 Ω |
D49-21 (PCTY) - Body ground |
V - Body ground |
Passenger side courtesy light switch input |
Passenger side door closed (OFF) → open (ON) |
10 kΩ or higher → Below 1 Ω |
D49-25 (BCTY) - Body ground |
GR - Body ground |
Back door courtesy light switch input |
Back door closed (OFF) → open (ON) |
10 kΩ or higher → Below 1 Ω |
D50-16 (HCTY) - Body ground |
BE - Body ground |
Security courtesy switch |
Engine hood closed (OFF) → open (ON) |
10 kΩ or higher → Below 1 Ω |
D50-24 (DCTY) - Body ground |
V - Body ground |
Driver side door courtesy light switch input |
Driver side door closed (OFF) → open (ON) |
10 kΩ or higher → Below 1 Ω |
2A-1 (ACC) - Body ground |
B - Body ground |
Ignition power supply (ACC signal) |
Engine switch on (ACC) → OFF |
11 to 14 V → Below 1 V |
2A-1 (IG) - Body ground |
B - Body ground |
Ignition power supply (IG signal) |
Engine switch on (IG) → OFF |
11 to 14 V → Below 1 V |
2C-30 (ALTB) - Body ground |
BR - Body ground |
+B (power system alternator system) power supply |
Always |
11 to 14 V |
2F-16 (GND1) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
2C-24 (BECU) - Body ground |
L - Body ground |
+B power supply |
Always |
11 to 14 V |
2C-24 (BECU) - Body ground |
L - Body ground |
+B power supply |
Always |
11 to 14 V |
2O-19 (LCTY) - Body ground |
R - Body ground |
Rear courtesy light switch LH input |
Rear door LH closed (OFF) → open (ON) |
10 kΩ or higher → Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
HINT:
Measure values on the wire harness side with the connectors disconnected.
(c) Reconnect the main body ECU (driver side junction block assembly) connectors.
(d) Measure the voltage according to the value(s) in the table below.
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
D48-4 (HAZ) - Body ground |
G - Body ground |
Turn signal flasher relay signal |
System in alarm sounding state |
Below 1 V |
D51-4 (IND) - Body ground |
SB - Body ground |
Security indicator output |
Security indicator on (It lights up only in arming preparation state or alarm sounding state. It flashes when immobiliser is operating.) |
3 to 6 V |
D51-6 (SH) - Body ground |
BR - Body ground |
Security horn drive |
Security horn sounding |
Pulse generation (Below 1 V ← → 12 V) |
2C-25 (HORN) - Body ground |
R - Body ground |
Vehicle horn drive |
Vehicle horn sounding (Theft deterrent system in alarm sounding state) |
Pulse generation (Below 1 V ← → 12 V) |
If the result is not as specified, the main body ECU (driver side junction block assembly) may have a malfunction.
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the rear view monitor system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
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General Information
GENERAL INFORMATION
A large number of ECU controlled systems are used in this vehicle. In
general, ECU controlled systems are considered to be very intricate, requiring
a high level of technical knowledge to troubleshoot. However, most problem ...
Precaution
PRECAUTION
1. WHEN DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following systems after the cable is reconnected.
System Name
See Proc ...