SELF-DIAGNOSTICS
| WARNING | Deactivate air bag system before performing any service operation. See AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy. |
When diagnosing multiplex control system, perform BODY CONTROL ECU and OPEN DOOR INDICATOR LIGHT inspection procedures first to ensure DTCs can be retrieved. See PRELIMINARY INSPECTION .
Scan Tool Method
Multiplex self-diagnostic system OBD-II DTCs are retrieved through Data Link Connector 3 (DLC3). DLC3 is located under left side of instrument panel. Connect scan tool to DLC3. Turn ignition on. Follow LEXUS or OBD-II scan tool instructions to retrieve DTCs. See MULTIPLEX DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS table. If DTC(s) are present, perform appropriate test. See DIAGNOSTIC TESTS .
| OBD-II DTC/2-Digit DTC | Description |
|---|---|
| B1211/11 | Driver's Door ECU To Body ECU Communication |
| B1212/12 | Passenger's Front Door ECU To Body ECU Communication |
| B1214/14 | Door System Bus Communication Circuit Short To Power |
| B1215/15 | Door System Bus Communication Circuit Short To Ground |
| B1216/16 | Right Rear Door ECU To Body ECU Communication |
| B1217/17 | Left Rear Door ECU To Body ECU Communication |
| B1221/21 | (1) Power Window Master Switch Circuit |
| B1222/22 | (1) Driver's Door Lock Control Switch Circuit |
| B1223/23 | (1) Passenger's Front Window Switch Circuit |
| B1224/24 | (1) Passenger's Door Lock Control Switch Circuit |
| B1225/25 | (1) Right Rear Window Switch Circuit |
| B1226/26 | (1) Left Rear Window Switch Circuit |
| B1231/31 | Driver's Jam Protection Limit Switch Circuit |
| B1232/32 | Driver's Jam Protection Pulse Switch Circuit |
| B1233/33 | Passenger's Front Jam Protection Limit Switch Circuit |
| B1234/34 | Passenger's Front Jam Protection Pulse Switch Circuit |
| B1235/35 | Right Rear Jam Protection Limit Switch Circuit |
| B1236/36 | Right Rear Jam Protection Pulse Switch Circuit |
| B1237/37 | Left Rear Jam Protection Limit Switch Circuit |
| B1238/38 | Left Rear Jam Protection Pulse Switch Circuit |
| B1241/41 | Body ECU Switch Circuit Diagnosis |
| B1242/42 | Wireless Door Lock Tuner Circuit Malfunction |
| B1244/44 | Light Sensor Circuit Malfunction |
| B1256/56 | Instrument Control Panel Circuit Diagnosis |
| B1261/61 | ECM To Body ECU Communication |
| B1272/72 | Memory Power Seat ECU To Body ECU Communication |
| B1273/73 | Sliding Roof Control ECU To Body ECU Communication |
| B1275/75 | Accessory Bus Buffer To Body ECU Communication |
| B1276/76 | A/C And Combination Meter Integrated ECU To Body ECU Communication |
| B1277/77 | Instrument Control Panel To Body ECU Communication |
| (1) DTC is not a malfunction. DTC displays switch function. If DTC is not displayed when switch is operated, failure in switch contact exists. If DTC is displayed when switch is not operated, switch is stuck. | |
| (1) | DTC is not a malfunction. DTC displays switch function. If DTC is not displayed when switch is operated, failure in switch contact exists. If DTC is displayed when switch is not operated, switch is stuck. |
MULTIPLEX DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS
CLEARING DIAGNOSTIC TROUBLE CODES
Note. DTCs will be cleared from memory when DTC is normally retrieved.
DIAGNOSTIC TESTS
| WARNING | Deactivate air bag system before performing any service operation. See AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy. |