Lexus NX manuals

Lexus NX: Lost Communication with "Door Control Module A" (U0199)

Lexus NX Service Manual / Power Source & Network / Networking / Can Communication System / Lost Communication with "Door Control Module A" (U0199)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U0199

Lost Communication with "Door Control Module A"

There is no communication from the outer mirror control ECU assembly LH.
  • Power source circuit of outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly LH ground circuit
  • Outer mirror control ECU assembly LH CAN branch wire or connector
  • Outer mirror control ECU assembly LH

Main Body

For vehicles with a memory.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery.

    Click here

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait at least 20 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

PROCEDURE

1.

RECONFIRM DTC OUTPUT

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

HINT:

If DTC U1002 is output from the gateway of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

Result

Proceed to

DTC U1002 is not output from main body ECU (multiplex network body ECU)

A

DTC U1002 is output from main body ECU (multiplex network body ECU)

B
B

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

A

2.

CHECK FOR OPEN IN CAN BUS WIRE (OUTER MIRROR CONTROL ECU ASSEMBLY LH BRANCH WIRE)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

*a

Front view of wire harness connector

(to Outer Mirror Control ECU Assembly LH)

(b) Disconnect the outer mirror control ECU assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M5-9 (CANP) - M5-8 (CANN)

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω
NG

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH)
OK

3.

CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - BATTERY AND BODY GROUND)

(a) Reconnect the cable to the negative (-) auxiliary battery terminal.

*a

Front view of wire harness connector

(to Outer Mirror Control ECU Assembly LH)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

M5-5 (SIG) - Body ground

Power switch on (IG)

11 to 14 V

M5-6 (CPUB) - Body ground

Power switch off

11 to 14 V

M5-14 (BDR) - Body ground

Power switch off

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M5-7 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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