Toyota Camry owners & service manuals

Toyota Camry (XV70): Headup Display Communication Stop Mode

Toyota Camry Repair Manual XV70 (2018-2024) / Power Source, Network / Networking / Can Communication System / Headup Display Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Headup Display Communication Stop Mode

Any of the following conditions are met:

  • Communication stop for "Head Up Display" is indicated on the "Communication Bus Check" screen of the Techstream.

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  • Communication stop history for "Head Up Display" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Head Up Display" is 6 or more.)

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  • Communication system DTCs (DTCs that start with U) that correspond to "Headup Display Communication Stop Mode" in "DTC Combination Table" are output.

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  • Meter mirror sub-assembly branch line or connector
  • Power source circuit of meter mirror sub-assembly
  • Meter mirror sub-assembly ground circuit
  • Meter mirror sub-assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

  • 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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  • Before measuring the resistance of the CAN bus, turn the ignition 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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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 ignition switch to ON 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.

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

HINT:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.

CHECK FOR OPEN IN CAN BUS LINES (METER MIRROR SUB-ASSEMBLY BRANCH LINE)

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

(b) Disconnect the p1 meter mirror sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

p1-12 (MPX1) - p1-13 (MPX2)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

*a

Front view of wire harness connector

(to Meter Mirror Sub-assembly)
NG

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (METER MIRROR SUB-ASSEMBLY)
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

p1-4 (ES) - Body ground

Cable disconnected from negative (-) battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Meter Mirror Sub-assembly)

(b) Reconnect the cable to the negative (-) battery terminal.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

p1-2 (B) - Body ground

Always

11 to 14 V

p1-1 (IG) - Body ground

Ignition switch ON

11 to 14 V
OK

REPLACE METER MIRROR SUB-ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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