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

WIPER / WASHER WIPER AND WASHER SYSTEM B127987 Humidity/Rain Sensor Missing Message

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
B127987	Humidity/Rain Sensor Missing Message	Detection Condition: Auxiliary battery voltage is 9.5 V or more Malfunction Status: Communication malfunction with rain sensor Malfunction Duration: 10 seconds or more	· Rain sensor · Harness or connector · Main body ECU (multiplex network body ECU) · Power distribution box assembly	○	Main Body

WIRING DIAGRAM

1.875,1.729 2.458,2.302 0.583,0.573 10 false ECU-IGR NO.2 2.656,1.875 3.5,2.229 0.844,0.354 10 false IGR NO.2 5.771,1.552 7.125,2 1.354,0.448 10 false Auxiliary Battery 1.302,2.5 1.74,2.698 0.438,0.198 10 false MB 1.333,2.271 1.573,2.427 0.24,0.156 10 false 27 1.385,3 1.625,3.156 0.24,0.156 10 false 11 1.333,3.208 1.771,3.385 0.438,0.177 10 false E36 4.875,2.49 5.167,2.677 0.292,0.188 10 false 4B 4.885,2.281 5.125,2.438 0.24,0.156 10 false 38 5.469,2.396 5.625,2.573 0.156,0.177 10 false 4 5.646,2.49 5.948,2.698 0.302,0.208 10 false SIG 5.656,3.219 6.021,3.448 0.365,0.229 10 false MPX 6.385,2.625 6.656,2.823 0.271,0.198 10 false ES 5.458,3.021 5.615,3.198 0.156,0.177 10 false 3 6.688,2.51 6.844,2.688 0.156,0.177 10 false 2 0.948,2.479 1.25,2.688 0.302,0.208 10 false IGR 0.885,3.208 1.229,3.417 0.344,0.208 10 false LIN4 0.083,3.646 2.083,4.031 2,0.385 10 false Main Body ECU (Multiplex Network Body ECU) 0.594,4.479 2.771,4.76 2.177,0.281 10 false : LIN Communication Line 5.792,3.635 6.948,3.927 1.156,0.292 10 false Rain Sensor 5.552,3.635 6.708,3.927 1.156,0.292 10 false Q3 1.906,2.917 5.573,3.333 3.667,0.417 10 false Power Distribution Box Assembly 5.625,0.521 7.156,1.156 1.531,0.635 10 false Certification ECU (Smart Key ECU Assembly) 4.896,0.531 5.188,0.719 0.292,0.188 10 false 4B 4.896,0.302 5.135,0.458 0.24,0.156 10 false 11 4.875,1.542 5.167,1.729 0.292,0.188 10 false 4H 4.906,1.365 5.063,1.542 0.156,0.177 10 false 1 4.885,1.146 5.177,1.333 0.292,0.188 10 false 4B 4.896,0.958 5.135,1.115 0.24,0.156 10 false 36

CAUTION / NOTICE / HINT

NOTICE:: ·

Inspect the fuses of circuits related to this system before performing the following procedure.

·

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

PROCEDURE

1.CHECK FOR DTC

Read the DTCs.

Body Electrical > Main Body > Trouble Codes: 50001 449

Result:

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

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

GO TO DTC B276C88

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>B276C88202111,999999,_59,_111846,_0505202,RM100000001ZLXQ,B276C88

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.

Disconnect the Q3 rain sensor 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

3.CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

1.5,0.25 1.917,0.5 0.417,0.25 1.281,1.854 1.688,1.125 true 1.594,0.292 2,0.531 0.406,0.24 10 false E36 1.167,1.865 1.5,2.063 0.333,0.198 10 false LIN4 0.156,0.125 0.469,0.323 0.313,0.198 10 false *a

*a	Component without harness connected (Main Body ECU (Multiplex Network Body ECU)

Check for pulses according to the value(s) in the table below.

Standard Pulse:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E36)Location & Routingewd_type=routing;type=c;code=E36 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
E36-11 (LIN4) - Body ground	Ignition switch ON	Pulse generation

Tester Connection

Condition

Specified Condition

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

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

E36-11 (LIN4) - Body ground

Ignition switch ON

Pulse generation

Result:

Proceed to
OK
NG

4.CHECK HARNESS AND CONNECTOR (POWER SOURCE - RAIN SENSOR)

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,

4.CHECK HARNESS AND CONNECTOR (POWER SOURCE - RAIN SENSOR)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Click Location & Routing(Q3)Location & Routingewd_type=routing;type=c;code=Q3 Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=4
Q3-4 (SIG) - Body ground	Ignition switch ON	11 to 14 V

Tester Connection

Condition

Specified Condition

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

Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=4

Q3-4 (SIG) - Body ground

Ignition switch ON

11 to 14 V

Result:

Proceed to
OK
NG

5.CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BODY GROUND)

6.CHECK HARNESS AND CONNECTOR (RAIN SENSOR - POWER DISTRIBUTION BOX ASSEMBLY)

5.CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(Q3)Location & Routingewd_type=routing;type=c;code=Q3 Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=2
Q3-2 (ES) - Body ground	Always	Below 1 Ω

Tester Connection

Condition

Specified Condition

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

Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=2

Q3-2 (ES) - Body ground

Always

Below 1 Ω

Result:

Proceed to
OK
NG

REPLACE RAIN SENSOR

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK HARNESS AND CONNECTOR (RAIN SENSOR - POWER DISTRIBUTION BOX ASSEMBLY)

Disconnect the 4B power distribution box assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(Q3)Location & Routingewd_type=routing;type=c;code=Q3 Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=4
4B-38 - Q3-4 (SIG)	Always	Below 1 Ω

Tester Connection

Condition

Specified Condition

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

Click Connector(Q3)Body>Roof Wire>Rain Sensorewd_type=component;type=c;code=Q3;pinno=4

4B-38 - Q3-4 (SIG)

Always

Below 1 Ω

Result:

Proceed to
OK
NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR