T-TT-0634-20

Tech Tip T-TT-0634-20
Subject
November 13, 2020
Market
DCM Replacement Preliminary Checks
Service Category
Section
Audio/Visual/Telematics
Cellular Communication
USA
Applicability
All Applicable Models
APPLICABLE VEHICLES
2020-2021
2021
2021
2021
2020-2021
2020-2021
2021
2020-2021
2021
2020-2021
C-HR
Avalon
Avalon HV
Venza HV
Tacoma
4Runner
RAV4 Prime
Corolla Hatchback
Corolla
Camry HV
2020-2021
2021
2020-2021
2020-2021
2020-2021
2021
2020-2021
2020-2021
2020-2021
Camry
Sienna HV
Highlander
Highlander HV
Tundra
Corolla HV
RAV4
RAV4 HV
Sequoia
CONDITION
Some vehicles may experience an issue related to the DCM, the following information is consolidating
the available diagnostic information in one document.
RECOMMENDATIONS
System Assessment:
1. Bulb Check (at IG on)
2. SOS Test Call (VIN and location confirmation)
3. Data List review (attach to TA case before contacting TAS)
DTC Direction:
1. DTCs U1117, B2779, U0198, B126A
- Make sure there is not aftermarket RES system installed that may be interfering with
the factory integrated system.
- Refer to the TIS: Service Lane, Knowledge Center, Customer Interview Forms:
Remote Connect Guide/Remote Services Guide and/or the Repair Manual for DCM
initialization.
2. DTC B15C5
- Likely set by dealer disconnecting the roof panel with the battery still connected or
holding the SOS button for an extended period.
- Diagnose per Repair Manual if not induced during vehicle diagnosis or repair.
Expires on
Ver. 2.12 01/01/2020 T
11/13/2021
© 2020, Toyota Motor Sales, USA
Page 1 of 2
Tech Tip T-TT-0634-20
November 13, 2020
Subject
Market
DCM Replacement Preliminary Checks
USA
Applicability
RECOMMENDATIONS
3. DTC B15DB
- If set in Audio system, check DCM operation.
- If set in Telematics, check Audio system.
- Check harness (USB wires) between DCM and Audio system per Repair Manual.
4. DTC B15A8/B15A804
- First check for TSB software OTA updates.
- Then follow Repair Manual diagnostic and repair information.
Additional Diagnostics:
1. If there is no data list available:
- Check Techstream communication with any other ECU in vehicle.
- Check the Techstream known bugs list in TIS (possible work around).
- Make sure the Techstream version is up to date.
- Try a 30+ minute battery reset and immediate IG ON per applicable TSB.
- Make sure the DCM software version is up to date per applicable TSB.
- Check power, ground and CAN at the DCM per Repair Manual.
2. For account/network related concerns (BEC account support requests), please refer to the
following:
TIS: Service Lane - Knowledge Center (tab):
- Quick Apps Check
- Remote Connect/Services Guide (Toyota)
- Telematics Customer Care Portal (TCCP)
3. For TAS help, please use the Connected Services “Analysis” pre-call worksheet
- Provide the Bulb Check/SOS Test Call/data list as instructed in detail.
LINK REFERENCES
-
Expires on
Ver. 2.12 01/01/2020 T
T-SB-0095-20: '20-'21 Camry, Camry HV, Corolla Hatchback, RAV4, RAV4 HV, '21
Corolla, Corolla HV, RAV4 Prime: DCM Reset and Firmware Update (LG)
11/13/2021
© 2020, Toyota Motor Sales, USA
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