TERMINALS OF ECU CHECK DRIVING SUPPORT ECU ASSEMBLY
 NOTICE: Do not apply excessive force to the connector. If a force of 10 kg or more is applied, the connector may be broken.
(a) Measure the voltage and resistance according to the value(s) in the table below. |
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
G39-23 (SPSW) - G39-28 (GND) |
R - W-B | Steering pad switch assembly signal (distance control signal) |
Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) off |
4.75 to 5.25 V | |
Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) on |
Below 1 V | |
G39-28 (GND) - Body ground |
W-B - Body ground | Ground |
Always | Below 1 Ω | |
G39-7 (B) - G39-28 (GND) |
B - W-B | Power source |
Engine switch on (IG) |
11 to 14 V | | Engine switch off |
Below 1 V | (b) Check for pulses according to the value(s) in the table below.
HINT: If
the waveform is not similar to that shown in the illustration, a
malfunction of a CAN bus line, terminating resistor, or the driving
support ECU assembly is suspected. |
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
G39-8 (CA1P) - G39-28 (GND) |
G - W-B | CAN communication signal |
Engine switch on (IG) |
Pulse generation (See waveform 1) | |
G39-9 (CA1N) - G39-28 (GND) |
W - W-B | Pulse generation
(See waveform 2) | |
G39-10 (CA2H) - G39-28 (GND) |
R - W-B | Pulse generation
(See waveform 1) | |
G39-11 (CA2L) - G39-28 (GND) |
W - W-B | Pulse generation
(See waveform 2) | (1) WAVEFORM 1
 |
Item | Content | |
Tester Connection |
- Between G39-8 (CA1P) and G39-28 (GND)
- Between G39-10 (CA2H) and G39-28 (GND)
| | Tool Setting |
1 V/DIV., 10 μsec./DIV. | |
Condition | Engine switch on (IG) |
HINT: The waveform varies depending on the CAN communication signal.
(2) WAVEFORM 2  |
Item | Content | |
Tester Connection |
- Between G39-9 (CA1N) and G39-28 (GND)
- Between G39-11 (CA2L) and G39-28 (GND)
| | Tool Setting |
1 V/DIV., 10 μsec./DIV. | |
Condition | Engine switch on (IG) |
HINT: The waveform varies depending on the CAN communication signal.
CHECK ECM  HINT: The
standard voltage, resistance and waveform between each pair of the ECM
terminals is shown in the table below. The appropriate conditions for
checking each pair of the terminals is also indicated. The result of
checks should be compared with the standard voltage, resistance and
waveform for each pair of the terminals as displayed in the Specified
Condition column. The illustration above can be used as a reference to
identify the ECM terminal locations. |
Terminal No. (Symbols) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
A18-27 (STP) - C56-53 (E1) |
SB - W-B | Stop light switch signal |
Brake pedal depressed |
7.5 to 14 V | | Brake pedal released |
Below 1.5 V | |
A18-41 (CCS) - C56-53 (E1) |
R - W-B | Steering pad switch circuit |
Cruise control switch not pushed |
1 MΩ or higher | |
Cruise control main switch pushed |
Below 2.5 Ω | |
CANCEL switch pushed |
228 to 252 Ω | |
+RES switch pushed | 599 to 661 Ω | |
-SET switch pushed | 1463 to 1617 Ω | |
A18-42 (ST1-) - C56-53 (E1) |
LG - W-B | Stop light switch signal |
Engine switch on (IG), brake pedal depressed |
0 to 1.5 V | | Engine switch on (IG), brake pedal released |
7.5 to 14 V |
 CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY
(a) Measure the voltage and resistance according to the value(s) in the table below. |
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
A25-1 (SGND) - Body ground |
W-B - Body ground | Ground |
Always | Below 1 Ω | |
A25-8 (IGB) - A25-1 (SGND) |
R - W-B | Power source |
Engine switch on (IG) |
11 to 14 V | (b) Check for pulses according to the value(s) in the table below.
HINT: If
the waveform is not similar to that shown in the illustration, a
malfunction of a CAN bus line, terminating resistor, or the millimeter
wave radar sensor assembly is suspected. |
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
A25-3 (CA2H) - A25-1 (SGND) |
R - W-B | CAN communication signal |
Engine switch on (IG) |
Pulse generation (See waveform 1) | |
A25-2 (CA2L) - A25-1 (SGND) |
W - W-B | Pulse generation
(See waveform 2) | |
A25-5 (CA1P) - A25-1 (SGND) |
G - W-B | Pulse generation
(See waveform 1) | |
A25-6 (CA1N) - A25-1 (SGND) |
W - W-B | Pulse generation
(See waveform 2) | (1) WAVEFORM 1
|
Item | Content | |
Tester Connection |
- Between A25-3 (CA2H) and A25-1 (SGND)
- Between A25-5 (CA1P) and A25-1 (SGND)
| | Tool Setting |
1 V/DIV., 10 μsec./DIV. | |
Condition | Engine switch on (IG) |
HINT: The waveform varies depending on the CAN communication signal.
(2) WAVEFORM 2 |
Item | Content | |
Tester Connection |
- Between A25-2 (CA2L) and A25-1 (SGND)
- Between A25-6 (CA1N) and A25-1 (SGND)
| | Tool Setting |
1 V/DIV., 10 μsec./DIV. | |
Condition | Engine switch on (IG) |
HINT: The waveform varies depending on the CAN communication signal. | 
