Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GMAZ |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [01/2019 - 09/2019] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DCM Communication Stop Mode; 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019] |
DCM Communication Stop Mode
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DESCRIPTION
Detection Item
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Symptom
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Trouble Area
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DCM Communication Stop Mode
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Any of the following conditions are met:
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Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
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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
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Communication system DTCs (DTCs that start with U) that correspond to "DCM Communication Stop Mode" in "DTC Combination Table" are output.
Click here
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DCM (telematics transceiver) branch line or connector
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Power source circuit of DCM (telematics transceiver)
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DCM (telematics transceiver) ground circuit
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DCM (telematics transceiver)
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
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When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1.
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CHECK FOR OPEN IN CAN BUS LINES (DCM (TELEMATICS TRANSCEIVER) BRANCH LINE)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the I72 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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I72-15 (CANP) - I72-16 (CANN)
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Cable disconnected from negative (-) battery terminal
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54 to 69 Ω
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|
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*a
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Front view of wire harness connector
(to DCM (Telematics Transceiver))
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|
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NG |
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REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (DCM (TELEMATICS TRANSCEIVER))
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OK
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2.
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CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
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(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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I72-4 (E) - Body ground
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Cable disconnected from negative (-) battery terminal
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Below 1 Ω
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*a
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Front view of wire harness connector
(to DCM (Telematics Transceiver))
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|
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(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
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Condition
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Specified Condition
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I72-1 (+B) - Body ground
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Always
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11 to 14 V
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I72-7 (IG2) - Body ground
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Ignition switch ON
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11 to 14 V
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I72-8 (ACC) - Body ground
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Ignition switch ACC
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11 to 14 V
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
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