RM38N0EC _59 Vehicle Exterior _111846 WIPER / WASHER _0505202 WIPER AND WASHER SYSTEM C

WIPER / WASHER WIPER AND WASHER SYSTEM B276C88 Alarm / Wiper LIN Bus off

DESCRIPTION

The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from
B276C88	Alarm / Wiper LIN Bus off	Detection condition: Ignition switch ON (IG+ voltage 9.5 V or higher) Malfunction Status: Wire-type LIN communication error detected Malfunction Time: 7 seconds or more	· Rain sensor · Harness or connector · Main body ECU (multiplex network body ECU)	○	Main Body

WIRING DIAGRAM

0.625,2.406 2.583,2.708 1.958,0.302 10 false : LIN Communication Line 1.927,1.656 3.573,2.094 1.646,0.438 10 false Rain Sensor 1.688,1.646 2,1.844 0.313,0.198 10 false Q3 2.333,1.01 2.792,1.208 0.458,0.198 10 false MPX 2.76,0.875 2.917,1.073 0.156,0.198 10 false 3 4.24,0.875 4.458,1.073 0.219,0.198 10 false 11 4.531,1.031 5.146,1.229 0.615,0.198 10 false LIN4 4.354,1.656 6.875,2.344 2.521,0.688 10 false Main Body ECU (Multiplex Network Body ECU) 4.042,1.667 4.5,1.865 0.458,0.198 10 false E36

CAUTION / NOTICE / HINT

NOTICE:: Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE

1.CHECK RAIN SENSOR

Clear the DTCs.

Body Electrical > Main Body > Clear DTCs: 50002 449

Disconnect the Q3 rain sensor connector.

Turn the ignition switch to ON and wait for at least 10 seconds.

Read the DTCs.

Body Electrical > Main Body > Trouble Codes: 50001 449

Result:

Result	Proceed to
Only DTC B127987 is output	A
DTC B276C88 is output	B

REPLACE RAIN SENSOR

Click hereVehicle Exterior>WIPER / WASHER>RAIN SENSOR>REMOVAL202111,999999,_59,_111846,_0500799,RM100000001Z3XW,

2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - RAIN SENSOR)

Disconnect the E36 main body ECU (multiplex network body ECU) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E36,Q3)Location & Routingewd_type=routing;type=c,c;code=E36,Q3 Click Connector(E36)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Multiplex Network Body ECUewd_type=component;type=c;code=E36;pinno=11 Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=3
E36-11 (LIN4) - Q3-3 (MPX)	Always	Below 1 Ω
E36-11 (LIN4) or Q3-3 (MPX) - Body ground	Always	10 kΩ or higher

Tester Connection

Condition

Specified Condition

Click Location & Routing(E36,Q3)Location & Routingewd_type=routing;type=c,c;code=E36,Q3

Click Connector(E36)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Multiplex Network Body ECUewd_type=component;type=c;code=E36;pinno=11

Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=3

E36-11 (LIN4) - Q3-3 (MPX)

Always

Below 1 Ω

E36-11 (LIN4) or Q3-3 (MPX) - Body ground

Always

10 kΩ or higher

Result:

Proceed to
OK
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL202111,202203,_57,_111828,_0500082,RM100000001Z1A6,202203,202303,_57,_111828,_0500082,RM1000000022I31,202303,202406,_57,_111828,_0500082,RM100000002B19F,202406,999999,_57,_111828,_0500082,RM100000002MQ55,

REPAIR OR REPLACE HARNESS OR CONNECTOR