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Home >> Lexus >> 1999 >> RX 300 AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Control Systems >> Self-Diagnostics >> Retrieving Diagnostic Trouble Codes >> Scan Tool Method

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) is present, perform test(s) in order given. Go to appropriate DTC under DIAGNOSTIC TESTS .

MULTIPLEX DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS

OBD-II DTC/2-Digit DTC Description
B1211/11  No Communication Between Driver's Door ECU & Body ECU
B1212/12  No Communication Between Passenger's Front Door ECU & Body ECU
B1214/14  Door System Bus Communication Circuit Is Shorted To Battery Voltage
B1215/15  Door System Bus Communication Circuit Is Shorted To Ground
B1216/16  No Communication Between Right Rear Door ECU & Body ECU
B1217/17  No Communication Between Left Rear Door ECU & Body ECU
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  No Communication Between ECM & Body ECU
B1272/72  No Communication Between Power Seat ECU (W/Memory) & Body ECU
B1273/73  No Communication Between Sun Roof Control ECU & Body ECU
B1275/75  No Communication Between Accessory Bus Buffer & Body ECU
B1276/76  No Communication Between Combination Meter ECU & Body ECU
B1277/77  No Communication Between Instrument Control Panel & Body ECU
(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.