Lexus IS250 IS220d GSE20 ALE20 - CRUISE CONTROL
DYNAMIC RADAR CRUISE CONTROL SYSTEM - TERMINALS OF ECU
| CHECK DISTANCE CONTROL ECU |
| 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 |
Reference: waveform 1
- HINT:
Terminal: LRDD - SGND
Gauge set: 2 V/DIV., 10 msec./DIV.
Condition: Engine switch on (IG)
Reference: waveform 2
- HINT:
Terminal: LRRD - SGND
Gauge set: 2 V/DIV., 5 msec./DIV.
Condition: Engine switch on (IG)
| CHECK ECM |
If the value is not within the specified range, the ECM may have a malfunction.
| 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:
LHD (*1)
RHD (*2)
| CHECK MILLIMETER WAVE RADAR SENSOR |
| 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 |
Reference: waveform 1
- HINT:
Terminal: LRDD - SGND
Gauge set: 2 V/DIV., 10 msec./DIV.
Condition: Engine switch on (IG)
Reference: waveform 2
- HINT:
Terminal: LRRD - SGND
Gauge set: 2 V/DIV., 5 msec./DIV.
Condition: Engine switch on (IG)