Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Wireless Door Lock Control System(w/ Smart Key System) / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the MB main body ECU (multiplex network body ECU) connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
MB-11(GND1) - Body ground	-	Ground	Always	Below 1 Ω
MB-31 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
MB-30 (ACC) - Body ground	-	ACC power supply	Engine switch ACC	11 to 14 V
MB-30 (ACC) - Body ground	-	ACC power supply	Engine switch off	Below 1 V
MB-32 (IG) - Body ground	-	IG power supply	Engine switch ON	11 to 14 V
MB-32 (IG) - Body ground	-	IG power supply	Engine switch off	Below 1 V

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

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
1D-1 (ACT+) - Body ground	R - Body ground	Door lock motor unlock drive output (except driver door)	Door control switch (power window regulator master switch assembly) or driver door key cylinder off	Below 1 V
1D-1 (ACT+) - Body ground	R - Body ground	Door lock motor unlock drive output (except driver door)	Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked	11 to 14 V
1H-12 (ACT+) - Body ground	LA-R - Body ground	Door lock motor unlock drive output (except driver door)	Door control switch (power window regulator master switch assembly) or driver door key cylinder off	Below 1 V
1H-12 (ACT+) - Body ground	LA-R - Body ground	Door lock motor unlock drive output (except driver door)	Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked	11 to 14 V
1H-10 (ACT-) - Body ground	LA-G - Body ground	Door lock motor lock drive output (all doors)	Door control switch (power window regulator master switch assembly) or driver door key cylinder off	Below 1 V
1H-10 (ACT-) - Body ground	LA-G - Body ground	Door lock motor lock drive output (all doors)	Door control switch (power window regulator master switch assembly) or driver door key cylinder locked	11 to 14 V
1D-3 (ACT-) - Body ground	G - Body ground	Door lock motor lock drive output (all doors)	Door control switch (power window regulator master switch assembly) or driver door key cylinder off	Below 1 V
1D-3 (ACT-) - Body ground	G - Body ground	Door lock motor lock drive output (all doors)	Door control switch (power window regulator master switch assembly) or driver door key cylinder locked	11 to 14 V
1D-2 (ACTD) - Body ground	B - Body ground	Driver door lock motor unlock drive output	Door control switch (power window regulator master switch assembly) or driver door key cylinder off	Below 1 V
1D-2 (ACTD) - Body ground	B - Body ground	Driver door lock motor unlock drive output	Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked	11 to 14 V
M6-27 (FRCY) - Body ground	LG - Body ground	Front door courtesy light switch RH input	Front door RH open	Below 1 V
M6-27 (FRCY) - Body ground	LG - Body ground	Front door courtesy light switch RH input	Front door RH open	11 to 14 V
M6-6 (FLCY) - Body ground	Y - Body ground	Front door courtesy light switch LH input	Front door LH open	Below 1 V
M6-6 (FLCY) - Body ground	Y - Body ground	Front door courtesy light switch LH input	Front door LH closed	11 to 14 V
1H-36 (LCTY) - Body ground	P - Body ground	Rear door courtesy light switch LH input1 Upper access panel lock assembly LH input2 Lower access panel lock assembly LH input*2	Rear door LH open	Below 1 V
1H-36 (LCTY) - Body ground	P - Body ground	Rear door courtesy light switch LH input1 Upper access panel lock assembly LH input2 Lower access panel lock assembly LH input*2	Rear door LH closed	Pulse generation
1D-30 (RCTY) - Body ground	V - Body ground	Rear door courtesy light switch RH input1 Upper access panel lock assembly RH input2 Lower access panel lock assembly RH input*2	Rear door RH open	Below 1 V
1D-30 (RCTY) - Body ground	V - Body ground	Rear door courtesy light switch RH input1 Upper access panel lock assembly RH input2 Lower access panel lock assembly RH input*2	Rear door RH closed	Pulse generation
1D-11 (LSFL) - Body ground	P - Body ground	Front door LH unlock detection switch input	Front door LH unlocked	Below 1 V
1D-11 (LSFL) - Body ground	P - Body ground	Front door LH unlock detection switch input	Engine switch off, all doors closed and front door LH locked	Pulse generation
1D-24 (LSFR) - Body ground	GR - Body ground	Front door RH unlock detection switch input	Front door RH unlocked	Below 1 V
1D-24 (LSFR) - Body ground	GR - Body ground	Front door RH unlock detection switch input	Engine switch off, all doors closed and front door RH locked	Pulse generation
1A-41 (LSR) - Body ground	Y - Body ground	Rear door RH unlock detection switch input	Rear door RH or LH unlocked	Below 1 V
1A-41 (LSR) - Body ground	Y - Body ground	Rear door RH unlock detection switch input	Engine switch off, all doors closed and rear door RH and LH locked	Pulse generation
1H-27 (LSR) - Body ground	L - Body ground	Rear door LH unlock detection switch input	Rear door LH or RH unlocked	Below 1 V
1H-27 (LSR) - Body ground	L - Body ground	Rear door LH unlock detection switch input	Engine switch off, all doors closed and rear door LH and RH locked	Pulse generation
1F-29 (BZR) - Body ground	Y - Body ground	Wireless door lock buzzer signal	Wireless door lock buzzer off	Below 1 V
1F-29 (BZR) - Body ground	Y - Body ground	Wireless door lock buzzer signal	Wireless door lock buzzer on	Pulse generation

*1: for Double Cab
*2: for Access Cab

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

2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the C27 and C29 certification ECU (smart key ECU assembly) connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
C29-11 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
C29-10 (+B) - Body ground	P - Body ground	Battery power supply	Always	11 to 14 V
C27-4 (CUTB) - Body ground	GR - Body ground	Dark current cut fuse pin input signal	Always	11 to 14 V

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

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
C27-3 (IG1D) - C29-11 (E)	B - W-B	IG power supply	Engine switch on (IG)	11 to 14 V
C27-3 (IG1D) - C29-11 (E)	B - W-B	IG power supply	Engine switch off	Below 1 V
C28-19 (CSEL) - C29-11 (E)	SB - W-B	Communication channel switching circuit	Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed → electrical key transmitter sub-assembly switch released	Below 1 V → 4.5 to 6.0 V → Below 1 V
C28-20 (RDAM) - C29-11 (E)	G - W-B	RF Signal input circuit	Engine switch off	11 to 14 V pulse generation at regular intervals
C28-18 (RCO) - C29-11 (E)	L - W-B	Wireless tuner power supply output circuit	Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed	Below 1 V → 4.5 to 5.5 V

If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

3. CHECK DOOR CONTROL RECEIVER

(a) Disconnect the T24 door control receiver connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
T24-7 (+B) - Body ground	BE - Body ground	Battery (power supply)	Always	10 to 16 V
T24-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
T24-6 (CSEL) - T24-12 (GND)	SB - W-B	Smart system receiving channel switching signal input	Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed → electrical key transmitter sub-assembly switch released	Below 1 V → 4.5 to 6.0 V → Below 1 V
T24-2 (DATA) - T24-12 (GND)	G - W-B	Smart system recovery code output	Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed → electrical key transmitter sub-assembly switch released	Below 1 V → 10 to 16 V → Below 1 V
T24-8 (+5) - T24-12 (GND)	L - W-B	Receive mode switching signal input	Engine switch off, all doors closed and electrical key transmitter sub-assembly switch not pressed → electrical key transmitter sub-assembly switch pressed	Below 1 V → 4.5 to 5.5 V

If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

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