Toyota Camry (XV70): DCM Communication Stop Mode

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

DESCRIPTION

Detection Item	Symptom	Trouble Area
DCM Communication Stop Mode	Any of the following conditions are met: Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "DCM" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "DCM" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "DCM Communication Stop Mode" in "DTC Combination Table" are output. Click here	DCM (telematics transceiver) branch line or connector Power source circuit of DCM (telematics transceiver) DCM (telematics transceiver) ground circuit DCM (telematics transceiver)

Detection Item

Symptom

Trouble Area

DCM Communication Stop Mode

Any of the following conditions are met:

Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "DCM" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "DCM" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "DCM Communication Stop Mode" in "DTC Combination Table" are output.
Click here

DCM (telematics transceiver) branch line or connector
Power source circuit of DCM (telematics transceiver)
DCM (telematics transceiver) ground circuit
DCM (telematics transceiver)

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.
Click here
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.
Click here
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.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the DCM (telematics transceiver), refer to Registration.
- w/ Smart Key System
  Click here
- w/o Smart Key System
  Click here

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 (DCM (TELEMATICS TRANSCEIVER) BRANCH LINE)

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

(b) Disconnect the K140 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K140-25 (CANP) - K140-26 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (DCM (TELEMATICS TRANSCEIVER))

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
K140-20 (E) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K140-1 (+B) - Body ground	Always	11 to 14 V
K140-19 (IG2) - Body ground	Ignition switch ON	11 to 14 V

REPLACE DCM (TELEMATICS TRANSCEIVER)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

SEE MORE:

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CAUTION / NOTICE / HINT NOTICE: Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System. Click here When replacing the radio and display

Removal

REMOVAL PROCEDURE 1. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH Click here 2. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH Click here 3. REMOVE ENGINE UNDER COVER NO.1 Click here 4. REMOVE ENGINE UNDER COVER REAR LH Click here 5. REMOVE ENGINE UNDER COVER REAR RH

Toyota Camry (XV70): DCM Communication Stop Mode

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Touch Panel Switch does not Function

Removal