Lexus RX300 (MCU15). Service 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
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