Lexus IS250 IS220d GSE20 ALE20 - PRE-CRASH SAFETY
PRE-CRASH SAFETY SYSTEM - DIAGNOSIS SYSTEM
| CHECK DLC3 |
The seat belt control ECU uses CAN and ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
| Symbols (Terminals No.) | Terminal Description | Condition | Specified Condition |
| SIL (7) - SG (5) | Bus "+" line | During transmission | Pulse generation |
| CG (4) - Body ground | Chassis ground | Always | Below 1 Ω |
| SG (5) - Body ground | Signal ground | Always | Below 1 Ω |
| BAT (16) - Body ground | Battery positive | Always | 10 to 14 V |
| CANH (6) - CANL | HIGH - level CAN bus line | Engine switch off | 54 to 67 Ω |
| CANH (6) - Battery positive | HIGH - level CAN bus line | Engine switch off | 1 MΩ or higher |
| CANH (6) - CG (4) | HIGH - level CAN bus line | Engine switch off | 3 MΩ or higher |
| CANL (14) - Battery positive | LOW - level CAN bus line | Engine switch off | 1 MΩ or higher |
| CANL (14) - CG (4) | LOW - level CAN bus line | Engine switch off | 3 MΩ or higher |
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
- HINT:
- Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
| FUNCTION OF WARNING INDICATOR AND MESSAGE |
If the pre-crash safety is not functioning properly, the driver is warned by the master warning indicator and multi-information display warning message on the combination meter.
| Master Warning Indicator | Warning Message | Detail | DTC | PCS Warning indicator |
| ON | CHECK PCS SYSTEM | This message appears when the seat belt control ECU detects a system malfunction | ○ | ON |
| Illuminate | PCS NOT AVAILABLE NOW | This message appears when the seat belt control ECU is in the fail-safe mode | - | Blinking |
Initial check.
The initial check occurs when the engine switch is off for more than 2 seconds, and then turned on (IG). The initial check consists of a pre-crash safety diagnostic check with a duration of approximately 3 seconds.
If a malfunction is detected during the initial check, the multi-information display will output "CHECK PCS SYSTEM " or "PCS NOT AVAILABLE NOW".
Constant check.
The seat belt control ECU and distance control ECU constantly monitor the pre-crash safety for malfunctions after the initial check approximately 3 seconds after turning the engine switch on (IG).
"CHECK PCS SYSTEM" or "PCS NOT AVAILABLE NOW" is displayed on the multi-information display in the combination meter assembly when the constant check detects malfunctions in the pre-crash safety.