Terminals Of Ecu

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.

CHECK MAIN BODY ECU

Fig 1: Identifying Terminals Of Main Body ECU Connector (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Terminals Of Main Body ECU Connector (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the 4B and 4E main body ECU (vehicle rear side) connectors.

Measure the voltages of the wire harness side connectors.

Standard voltage:

TERMINALS VOLTAGES CHART

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
BECU (4B-30) - GND1 (4E-17)	L-W-B	Battery (Power supply)	Always	11 to 14 V
GND1 (4E-17)-Body ground	W-B - Body ground	Ground	Always	Below 1 V

If the result is not as specified, there may be a malfunction in the wire harness.

Reconnect the main body ECU (vehicle rear side) connectors.

Measure the voltages of the wire harness side connectors.

Standard voltage:

TERMINALS VOLTAGES CHART

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

DCTY(4A-21)-Body ground

R - Body ground

Driver door courtesy switch input

Driver door closed

11 to 14 V

DCTY(4A-21)-Body ground

R - Body ground

Driver door courtesy switch input

Driver door open

Below 1 V

PCTY (4A-24) - Body ground

L - Body ground

Front passenger door courtesy switch input

Front passenger door closed

11 to 14 V

PCTY (4A-24) - Body ground

L - Body ground

Front passenger side door courtesy switch input

Front passenger door open

Below 1 V

RRCY (4A-20)⁽³⁾ - Body ground

L - Body ground

Rear RH door courtesy switch input

Rear RH door closed

11 to 14 V

RRCY (4A-20)⁽³⁾ - Body ground

L - Body ground

Rear RH door courtesy switch input

Rear RH door open

Below 1 V

RRCY (4A-5)⁽³⁾ - Body ground

G - Body ground

Rear LH door courtesy switch input

Rear LH door closed

11 to 14 V

RRCY (4A-5)⁽³⁾ - Body ground

G - Body ground

Rear LH door courtesy switch input

Rear LH door open

Below 1 V

RRCY (4A-5)⁽⁴⁾ - Body ground

Y - Body ground

Rear LH and RH door courtesy switch input

Rear LH and RH door closed

11 to 14 V

RRCY (4A-5)⁽⁴⁾ - Body ground

Y - Body ground

Rear LH and RH door courtesy switch input

Rear LH or RH door open

Below 1 V

BCTY (4A-7)⁽¹⁾ - Body ground

SB - Body ground

Back door courtesy switch input

Back door closed

11 to 14 V

BCTY (4A-7)⁽¹⁾ - Body ground

SB - Body ground

Back door courtesy switch input

Back door open

Below 1 V

LCTY (4A-7)⁽²⁾ - Body ground

SB - Body ground

Luggage compartment door courtesy switch input

Luggage compartment door closed

11 to 14 V

LCTY (4A-7)⁽²⁾ - Body ground

SB - Body ground

Luggage compartment door courtesy switch input

Luggage compartment door open

Below 1 V

PKB (4C-2) - Body ground

Y - Body ground

Parking brake switch input

Parking brake switch ON

Below 1 V

PKB (4C-2) - Body ground

Y - Body ground

Parking brake switch input

Parking brake switch OFF

11 to 14 V

ILE (4K-2) - Body ground

P - Body ground

Illumination signal (To room light assembly)

Room light switch in DOOR position and room light assembly comes on

11 to 14 V

ILE (4K-2) - Body ground

P - Body ground

Illumination signal (To room light assembly)

Room light switch in OFF position and room light assembly comes off

Below 1 V

⁽¹⁾

Hatchback

⁽²⁾

Sedan

⁽³⁾	Hatchback, Sedan except *5

⁽⁴⁾

Sedan *5

*5: Cold area specification, w/ Engine immobilizer system, w/ ABS, w/ Rear window defogger, w/ Power door lock system, w/ Daytime running light, w/ Remote control mirror, w/ Air conditioning If the result is not as specified, there may be a malfunction in the wire harness.