Lexus NX: Headup Display Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
Headup Display Communication Stop Mode | Any of the following conditions are met: | -
Meter mirror sub-assembly branch wire or connector
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Power source circuit of meter mirror sub-assembly
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Meter mirror sub-assembly ground circuit
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Meter mirror sub-assembly
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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Inspect the fuses for circuits related to this system before performing the following procedure.
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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.
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After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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When disconnecting and reconnecting the auxiliary battery.
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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Some parts must be initialized and set when replacing or removing and installing parts.
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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.
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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 for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
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After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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HINT:
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Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
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Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS WIRE (METER MIRROR SUB-ASSEMBLY BRANCH WIRE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the meter mirror sub-assembly connector. | | *a | Front view of wire harness connector (to Meter Mirror Sub-assembly) | | |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
J5-12 (MPX1) - J5-13 (MPX2) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω |
NG | | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR |
OK | | |
2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | J5-4 (ES) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | | | *a | Front view of wire harness connector (to Meter Mirror Sub-assembly) | | |
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Switch Condition | Specified Condition |
J5-1 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
Power switch off | Below 1 V |
J5-2 (B) - Body ground | Power switch off | 11 to 14 V |
OK | | REPLACE METER MIRROR SUB-ASSEMBLY |
NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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SEE MORE:
COMPONENTS ILLUSTRATION *1 COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY *2 FRONT FENDER TO COWL SIDE SEAL LH *3 FRONT FENDER TO COWL SIDE SEAL RH *4 FRONT WIPER ARM HEAD CAP *5 FRONT WIPER ARM LH *6 FRONT WIPER ARM RH *7 NO. 1 WINDSHIELD OUTSIDE MOULDING CLIP *8 WI
COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 AUXILIARY BATTERY NEGATIVE TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 COWL SIDE TRIM BOARD LH *2 DOOR SCUFF PLATE ASSEMBLY LH
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