Lexus IS250 · Service Manual CRUISE CONTROL SYSTEM

TERMINALS OF ECU

System information


CHECK DISTANCE CONTROL ECU
I034896E04
Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
J17-1 (B) - J17-12 (GND)
B - BR
Battery
Always
10 to 14 V
J17-8 (CANH) - J17-12 (GND)
GR- BR
CAN communication signal
CAN communication circuit
Pulse generation
J17-9 (CANL) - J17-12 (GND)
W - BR
CAN communication signal
CAN communication circuit
Pulse generation
J17-10 (SGND) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
J17-12 (GND) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
J17-13 (IGB) - J17-12 (GND)
P - BR
Engine switch on signal
Engine switch off
Below 1 V
J17-13 (IGB) - J17-12 (GND)
P - BR
Engine switch on signal
Engine switch on (IG)
10 to 16 V
J17-22 (LRDD) - J17-10 (SGND)
O - BR
Millimeter wave radar sensor input signal
Engine switch on (IG)
Pulse generation
(see waveform 1)
J17-23 (LRRD) - J17-10 (SGND)
L - BR
Millimeter wave radar sensor output signal
Engine switch on (IG)
Pulse generation
(see waveform 2)
J17-16 (MODE) - J17-12 (GND)
R - BR
Steering pad switch signal (Distance control switch signal)
Engine switch on (IG), Steering pad switch signal ON
0 to 2 V
J17-16 (MODE) - J17-12 (GND)
R - BR
Steering pad switch signal (Distance control switch signal)
Engine switch on (IG), Steering pad switch signal OFF
10 to 16 V

  1. E109730E01
    Reference: waveform 1

    HINT:
    1. Terminal: LRDD - SGND
    2. Gauge set: 2 V/DIV., 10 msec./DIV.
    3. Condition: Engine switch on (IG)

  2. E109731E01
    Reference: waveform 2

    HINT:
    1. Terminal: LRRD - SGND
    2. Gauge set: 2 V/DIV., 5 msec./DIV.
    3. Condition: Engine switch on (IG)


CHECK ECM
If the value is not within the specified range, the ECM may have a malfunction.
E109055E06
Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
A6-4 (STP) - E4-7 (E1)
R-B - BR
Stop light signal
Brake pedal released (Stop light switch off)
Below 1 V
A6-4 (STP) - E4-7 (E1)
R-B - BR
Stop light signal
Brake pedal depressed (Stop light switch on)
10 to 14 V
A6-31 (CCS) - E4-7 (E1)
L-B - BR
Cruise control main switch signal
Engine switch on (IG)
10 to 14 V
A6-31 (CCS) - E4-7 (E1)
L-B - BR
Cruise control main switch signal
CANCEL switch on
6.6 to 10.1 V
A6-31 (CCS) - E4-7 (E1)
L-B - BR
Cruise control main switch signal
- (COAST)/SET switch on
4.5 to 7.1 V
A6-31 (CCS) - E4-7 (E1)
L-B - BR
Cruise control main switch signal
+ (ACCEL)/RES (RESUME) switch on
2.3 to 4.0 V
A6-31 (CCS) - E4-7 (E1)
L-B - BR
Cruise control main switch signal
Main switch on
Below 1 V
A5-8 (ST1-) - E4-7 (E1)
G-W - BR
Stop light signal
Engine switch on (IG), Brake pedal depressed (Stop light switch on)
Below 1 V
A5-8 (ST1-) - E4-7 (E1)
G-W - BR
Stop light signal
Engine switch on (IG), Brake pedal released (Stop light switch off)
10 to 14 V
A5-20 (CCHG) - E4-7 (E1)
*1R-L - BR
*2W - BR
Distance control switch signal
Engine switch on (IG), Cruise control main switch on, MODE switch on
Below 1 V
A5-20 (CCHG) - E4-7 (E1)
*1R-L - BR
*2W - BR
Distance control switch signal
Engine switch on (IG), Cruise control main switch on, MODE switch off
10 to 14 V
A5-9 (LGND) - Body ground
A5-29 (LGND) - Body ground
B - Body ground
Ground
Always
Below 1 Ω
E4-7 (E1) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω

HINT:
  1. LHD (*1)
  2. RHD (*2)


CHECK MILLIMETER WAVE RADAR SENSOR
I039263E04
Symbols (Terminals No.)
Wiring Color
Terminal Description
Condition
Specified Condition
B9-1 (LGND) - Body ground
B - Body ground
Ground (Distance signal)
Always
Below 1 Ω
B9-2 (SGND) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
B9-3 (LRDD) - B9-2 (SGND)
L-B - BR
Millimeter wave radar sensor output signal
Engine switch on (IG)
Pulse generation
(see waveform 1)
B9-4 (LRRD) - B9-2 (SGND)
LG - BR
Millimeter wave radar sensor input signal
Engine switch on (IG)
Pulse generation
(see waveform 2)
B9-5 (IGB) - B9-2 (SGND)
P - BR
Power source
Engine switch on (IG)
10 to 14 V

  1. E109730E01
    Reference: waveform 1

    HINT:
    1. Terminal: LRDD - SGND
    2. Gauge set: 2 V/DIV., 10 msec./DIV.
    3. Condition: Engine switch on (IG)

  2. E109731E01
    Reference: waveform 2

    HINT:
    1. Terminal: LRRD - SGND
    2. Gauge set: 2 V/DIV., 5 msec./DIV.
    3. Condition: Engine switch on (IG)

← PROBLEM SYMPTOMS TABLEDIAGNOSIS SYSTEM →