DTC U2516, 16:Er12, DEVICE CODE:16 ERROR CODE:12, 26:Er81, DEVICE CODE:26 ERROR CODE:81 [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)]

id0902j4837500

DTC	U2516	Information display	CAN system communication error
	16:Er12	Audio unit (without Car-navigation system)
	Device code:16 error code:12	Car-navigation unit (with Car-navigation system)
	26:Er81	Hands-free telephone unit (without Car-navigation system)
	Device code:26 error code:81	Hands-free telephone unit (with Car-navigation system)
DETECTION CONDITION		Warning •  Perform the following on-board diagnosis according to FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)] troubleshooting procedure. •  CAN system-related harness malfunction •  CAN system-related module malfunction
POSSIBLE CAUSE		•  Malfunction of connectors between information display, car-navigation unit or audio unit, hands-free telephone unit and climate control unit •  Open or short circuit in wiring harness •  Information display malfunction •  Climate control unit malfunction •  Car-navigation unit or audio unit malfunction •  Hands-free telephone unit malfunction

Diagnostic procedure

Caution

•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

Step	Inspection		Action
1	VERIFICATION BEFORE SERVICING •  Are any DTCs, except the following, displayed? ―  U2516 ―  16:Er12 ―  Device code:16 error code:12 ―  26:Er81 ―  Device code:26 error code:81	Yes	Determine the open circuit location referring to DETERMINING MALFUNCTIONING PART (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].
		No	Go to the next step.
2	INSPECTION OF CONTROL MODULE CONNECTOR OUTPUTTING DTCs •  Inspect the terminal condition of the control module connector outputting DTCs and the mid-connector. •  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 9.
3	INSPECTION OF POWER SUPPLY OF CONTROL MODULE OUTPUTTING DTCs •  Refer to the terminal voltage table of the control module outputting DTCs to inspect the terminal voltage and fuse condition. •  Is the power supply voltage normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 9.
4	INSPECTION OF BODY GROUND CONDITION OF CONTROL MODULE OUTPUTTING DTCs •  Inspect the body ground wires and ground point of the control module outputting DTCs. •  Are the ground and ground point normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 9.
5	CAN SYSTEM RELATED WIRING HARNESS INSPECTION •  CAN system related wiring harness inspection: ―  Short to ground ―  Short to power supply ―  Short between twisted pair wiring harness ―  Open circuit •  Is the wiring harness normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 9.
6	INSPECT INFORMATION DISPLAY •  Disconnect the information display connector. •  Measure the resistance between the following information display connector terminals: ―  Between terminal J and terminal L (part side) •  Is the resistance 118—130 ohm?	Yes	Go to the next step.
		No	Replace the information display, then go to Step 9. (See INFORMATION DISPLAY REMOVAL/INSTALLATION.)
7	INSPECT CLIMATE CONTROL UNIT •  Disconnect the climate control unit connector. •  Measure the resistance between the following climate control unit connector terminals: ―  Between terminal J and terminal L (part side) •  Is the resistance 118—130 ohm?	Yes	Go to the next step.
		No	Replace the climate control unit, then go to Step 9. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
8	CAN RELATED MODULE VERIFICATION •  Remove only one of the CAN-related modules. •  Clear DTCs. •  Inspect the DTCs of all modules. •  Are DTCs U2516, 16:Er12, Device code:16 error code:12, 26:Er81, Device code:26 error code:81 displayed?	Yes	Reinstall the removed module, remove another module and perform the same inspection. Inspect all of the CAN-related modules using the same procedure. After inspecting all of the modules, go to the next step.
		No	Replace the removed module.
9	AFTER REPAIR VERIFICATION •  Connect all of the modules. •  Clear DTCs. •  Inspect the DTCs. •  Are DTCs displayed?	Yes	Perform the CAN system on-board diagnosis again according to the troubleshooting procedure (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
		No	DTC troubleshooting completed.