Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Turn the ignition switch OFF before measuring the resistances of the CAN main wire and the CAN branch wire.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)

Turn the ignition switch OFF.

Measure the resistance.

Standard resistance

RESISTANCE SPECIFICATION CONDITION CHART

Tester Connection	Condition	Specified Condition	Proceed to
D15-6 (CANH) - D15-14(CANL)	Ignition switch OFF	54 to 69 Ω	OK
D15-6 (CANH) - D15-14(CANL)	Ignition switch OFF	69 Ω or higher	NG-A
D15-6 (CANH) - D15-14 (CANL)	Ignition switch OFF	54 Ω or less	NG-B

Fig 1: Checking CAN Bus Wire (Main Wire For Disconnection, Bus Lines For Short Circuit)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG-A: CHECK CAN MAIN WIRE (FOR OPEN CIRCUIT)

NG-B: CHECK CAN BUS WIRE (FOR SHORT CIRCUIT)

OK: GO TO NEXT STEP

CHECK CAN BUS WIRE (FOR SHORT TO +B)

Turn the ignition switch OFF.

Measure the resistance.

Result

RESULT CHART

Tester Connection	Condition	Specified Condition	Proceed to
D15-6 (CANH) - D15-16 (BAT)	Ignition switch OFF	1 Ω or higher	OK
D15-14(CANL)- D15-16 (BAT)	Ignition switch OFF	1 Ω or higher	OK
D15-6 (CANH) - D15-16 (BAT)	Ignition switch OFF	Below 1 Ω	NG
D15-14(CANL)- D15-16 (BAT)	Ignition switch OFF	Below 1 Ω	NG

Fig 2: Checking CAN Bus Wire (For Short To +B)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK CAN BUS WIRE (FOR SHORT TO +B)

OK: GO TO NEXT STEP

CHECK CAN BUS WIRE (FOR SHORT TO GND)

Turn the ignition switch OFF.

Measure the resistance.

Result

RESULT CHART

Tester Connection	Condition	Specified Condition	Proceed to
D15-6(CANH)-D15-4(CG)	Ignition switch OFF	1 Ω or higher	OK
D15-14(CANL)-D15-4 (CG)	Ignition switch OFF	1 Ω or higher	OK
D15-6 (CANH) -D15-4(CG)	Ignition switch OFF	Below 1 Ω	NG
D15-14(CANL)-D15-4 (CG)	Ignition switch OFF	Below 1 Ω	NG

Fig 3: Checking CAN Bus Wire (For Short To GND)

NG: CHECK CAN BUS WIRE (FOR SHORT TO GND)

OK: HOW TO PROCEED WITH TROUBLESHOOTING