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

Toyota Tacoma (2015-2018) Service Manual / Theft Deterrent / Theft Deterrent System / Terminals Of Ecu

TERMINALS OF ECU

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

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

Text in Illustration

Main Body ECU (Multiplex Network Body ECU)

(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	Ignition switch ACC	11 to 14 V
MB-30 (ACC) - Body ground	-	ACC power supply	Ignition switch off	Below 1 V
MB-32 (IG) - Body ground	-	IG power supply	Ignition switch ON	11 to 14 V
MB-32 (IG) - Body ground	-	IG power supply	Ignition switch off	Below 1 V
MB-14 (TRLY) - Body ground	-	Supply battery to taillight relay drive	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 and check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
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	Ignition 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	Ignition switch off, all doors closed and front door RH locked	Pulse generation
1A-41 (LSR) - Body ground*1	Y - Body ground	Rear door RH unlock detection switch input	Rear door RH or LH unlocked	Below 1 V
1A-41 (LSR) - Body ground*1	Y - Body ground	Rear door RH unlock detection switch input	Ignition switch off, all doors closed and rear door RH and LH locked	Pulse generation
1H-27 (LSR) - Body ground*1	L - Body ground	Rear door LH unlock detection switch input	Rear door LH or RH unlocked	Below 1 V
1H-27 (LSR) - Body ground*1	L - Body ground	Rear door LH unlock detection switch input	Ignition switch off, all doors closed and rear door LH and RH locked	Pulse generation
1D-31 (KSW) - Body ground*3	G - Body ground	Key unlock warning switch input	Key in ignition key cylinder	Below 1 V
1D-31 (KSW) - Body ground*3	G - Body ground	Key unlock warning switch input	No key in ignition key cylinder	11 to 14 V or Pulse generation
M6-15 (IND) - Body ground*3	V - Body ground	Security indicator illumination	Security indicator light illuminates (It illuminates only for 57 seconds in alarm sounding state.)	3 to 10 V
1F-31 (SH) - Body ground	L - Body ground	Security horn drive	Security horn sounding (Theft deterrent system is in alarm sounding state)	Pulse generation (Below 1 V ← → 11 to 14 V)
1F-26 (HORN) - Body ground	L - Body ground	Vehicle horn drive	Vehicle horns sounding (Theft deterrent system is in alarm sounding state)	Pulse generation (Below 1 V ← → 11 to 14 V)
1F-28 (HRLY) - Body ground	W - Body ground	Headlight relay driver output	Headlight blinks (Theft deterrent system is in alarm sounding state)	Pulse generation (Below 1 V ← → 11 to 14 V)
1D-29 (ILE) - Body ground	BE - Body ground	Interior light driver output	Interior light illuminates (Theft deterrent system is in alarm sounding state)	11 to 14 V
M6-2 (UL3) - Body ground	G - Body ground	Driver door key-linked unlock input	Driver door key cylinder turned to neutral position → on (unlock)	Pulse generation → Below 1 V
M6-29 (L2) - Body ground	SB - Body ground	Driver door key-linked lock input	Driver door key cylinder turned to neutral position → on (lock)	Pulse generation → Below 1 V

*1: for Double Cab
*2: for Access Cab
*3: w/o Smart Key System

If the result is not as specified, the main body ECU (multiplex network body ECU) may have a malfunction.

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