Lexus RX300 (MCU15). Manual — part 363

N13628

Malfunction Code 12

Malfunction Code 11 and 12

0.25 sec.

0.25 sec.

1.5 sec.

Normal Code

4.5 sec.

0.5 sec.

0.5 sec.

2.5 sec.

4.5 sec.

D09456

DI–682

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

LEXUS RX300 (RM785E)

As an example, the blinking patterns for codes; normal, 12, and
11 and 12 are shown in the illustration.
(d)

Check for the problem using the DTC table on the next
page.

(e)

After completing the check, turn the ignition switch off,
and disconnect terminals 13 (TC) and 4 (CG).

4.

DTC CHECK (Using hand–held tester)

(a)

Prepare the hand–held tester.

(b)

Connect the hand–held tester to DLC3.

(c)

Turn the ignition switch ON and switch the hand–held tes-
ter main switch ON.

(d)

Use the hand–held tester to check the DTCs, note them
down. (For opening instructions, see the hand–held tes-
ter’s instruction book.)

(e)

See page DI–683 to confirm the details of the DTCs.

5.

DTC CLEARANCE

DTC will be cleared when the troble output to DTC is recovered
normally.

DI2AW–12

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–683

LEXUS RX300 (RM785E)

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit).

DTC No.

(See Page)

Detection Item

Trouble Area

B1211/11

(DI–688)

Driver door ECU communication stop

S Wireharness

S Driver door ECU

B1212/12

(DI–691)

Front passenger door ECU communication stop

S Wireharness

S Passenger door ECU

B1214/14

B1215/15

System communication bus malfunction (+B short)

S Wireharness

B1215/15

(DI–693)

System communication bus malfunction (GND short)

Wireharness

S ECU (Door system bus)

B1216/16

(DI–704)

Rear right door ECU communication stop

S Wireharness

S Rear right door ECU

B1217/17

(DI–706)

Rear left door ECU communication stop

S Wireharness

S Rear left door ECU

B1221/21

(DI–708)

Power window switch circuit on driver door

S Power window master switch

S Wireharness

B1222/22

(DI–708)

Door lock switch circuit on driver door

S Door lock control switch

S Door key lock and unlock switch

S Wireharness

B1223/23

(DI–708)

Power window switch circuit on passenger door

S Power window switch

S Wireharness

B1224/24

(DI–708)

Door lock switch circuit on passenger door

S Door lock control switch

S Door key lock and unlock switch

S Wireharness

B1225/25

(DI–708)

Power window switch circuit on rear right door

S Power window switch

S Wireharness

B1226/26

(DI–708)

Power window switch circuit on rear left door

S Power window switch

S Wireharness

B1231/31

(DI–710)

Jam protection limit switch circuit on driver door

S Power window motor

B1232/32

(DI–711)

Jam protection pulse switch circuit on driver door

Power window motor

S Wireharness

B1233/33

(DI–710)

Jam protection limit switch circuit on passenger door

S Power window motor

B1234/34

(DI–711)

Jam protection pulse switch circuit on passenger door

Power window motor

S Wireharness

B1235/35

(DI–710)

Jam protection limit switch circuit on rear right door

S Power window motor

B1236/36

(DI–711)

Jam protection pulse switch circuit on rear right door

Power window motor

S Wireharness

B1237/37

(DI–710)

Jam protection limit switch circuit on rear left door

S Power window motor

B1238/38

(DI–711)

Jam protection pulse switch circuit on rear left door

Power window motor

S Wireharness

B1241/41

(DI–708)

Body ECU switch circuit diagnosis

S Driver side buckle switch

S Stop light switch

S Light control switch

S Wireharness

DI–684

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

LEXUS RX300 (RM785E)

B1242/42

(DI–712)

Wireless door lock tuner circuit malfunction

S Wireharness

S Wireless door lock tuner

B1244/44

(DI–714)

Light sensor circuit malfunction

S Light sensor

S Wireharness

B1249/49

(DI–716)

Double lock ECU communication stop

S Wireharness

S Double lock ECU

B1256/56

(DI–708)

Center cluster integration panel switch circuit diagnosis

S Wireharness

S Center cluster integration panel

B1261/61

(DI–718)

ECM communication stop

S Wireharness

S Engine & ECT ECU

B1269/69

(DI–720)

Theft deterrent ECU communication stop

S Wireharness

S Theft deterrent ECU

B1273/73

(DI–722)

Sliding roof ECU communication stop

(w/ Sliding roof vehicle only)

S Wireharness

S Sliding roof ECU

B1275/75

Accessory bus buffer communication stop

S Wireharness

S Accessory

B1276/76

(DI–724)

A/C and combination meter integrated ECU communication

stop

S Wireharness

S A/C and combination meter integrated ECU

B1277/77

(DI–725)

Center cluster integration panel communication stop

S Wireharness

S Center cluster integration panel

HINT:
DTC 21∼26 and 41 don’t mean switch abnormal but notify how switch works.
If DTC is not output when operating switch, it means failure of switch contact.
If DTC is output when not opening switch, it means stick of switch.

DI2AX–06

I19181

Rear Left Door ECU

Rear Right Door ECU

Sliding Roof ECU

Driver Door ECU

Passenger Door ECU

Body ECU

A/C and Combination Meter
Integrated ECU

Center Cluster Integration Panel

Engine & ECT ECU

A/C and Combination Meter
Integrated ECU

Body ECU

Engine & ECT ECU

Center Cluster Integration Panel

Theft Deterrent ECU

Theft Deterrent ECU

LHD:

RHD:

Double Lock Control
Relay

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–685

LEXUS RX300 (RM785E)

PARTS LOCATION