THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: TERMINALS OF ECU; 2018 MY Camry HV [07/2017

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM1000000014WJ9
Model Year Start: 2018	Model: Camry HV	Prod Date Range: [07/2017 - 09/2018]
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: TERMINALS OF ECU; 2018 MY Camry HV [07/2017 - 09/2018]

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Reconnect the instrument panel junction block assembly connectors.

HINT:

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
MB-31 (BECU) - Body ground	-	Auxiliary battery power supply	Power switch off	11 to 14 V
MB-32 (IG) - Body ground	-	Ignition power supply (IG signal)	Power switch off	Below 1 V
MB-32 (IG) - Body ground	-	Ignition power supply (IG signal)	Power switch on (IG)	11 to 14 V
MB-30 (ACC) - Body ground	-	Ignition power supply (ACC signal)	Power switch off	Below 1 V
MB-30 (ACC) - Body ground	-	Ignition power supply (ACC signal)	Power switch on (ACC)	11 to 14 V
MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
K52-1 (FLCY) - Body ground	W - Body ground	Front door courtesy light switch assembly (for LH) input	Front door LH closed	10 kΩ or higher
K52-1 (FLCY) - Body ground	W - Body ground	Front door courtesy light switch assembly (for LH) input	Front door LH open	Below 1 Ω
K52-6 (FRCY) - Body ground	BE - Body ground	Front door courtesy light switch assembly (for RH) input	Front door RH closed	10 kΩ or higher
K52-6 (FRCY) - Body ground	BE - Body ground	Front door courtesy light switch assembly (for RH) input	Front door RH open	Below 1 Ω
MB-13 (LCTY) - Body ground	-	Rear door courtesy light switch assembly (for LH) input	Rear door LH closed	10 kΩ or higher
MB-13 (LCTY) - Body ground	-	Rear door courtesy light switch assembly (for LH) input	Rear door LH open	Below 1 Ω
MB-2 (RCTY) - Body ground	-	Rear door courtesy light switch assembly (for RH) input	Rear door RH closed	10 kΩ or higher
MB-2 (RCTY) - Body ground	-	Rear door courtesy light switch assembly (for RH) input	Rear door RH open	Below 1 Ω
K52-30 (HCTY) - Body ground	GR - Body ground	Engine hood courtesy switch input	Engine hood open	10 kΩ or higher
K52-30 (HCTY) - Body ground	GR - Body ground	Engine hood courtesy switch input	Engine hood closed	Below 1 Ω
MB-4 (LGCY) - Body ground	-	Luggage compartment door courtesy light switch input	Luggage compartment door closed	10 kΩ or higher
MB-4 (LGCY) - Body ground	-	Luggage compartment door courtesy light switch input	Luggage compartment door open	Below 1 Ω
MB-14 (TRLY) - Body ground	-	Taillight relay drive output	Power switch off	11 to 14 V

(d) Install the main body ECU (multiplex network body ECU) to instrument panel junction block assembly.

Click here

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
3B-13 (LSFL) - Body ground	W - Body ground	Front door LH unlock detection switch input	Front door LH unlocked	Below 1 V
3B-13 (LSFL) - Body ground	W - Body ground	Front door LH unlock detection switch input	Front door LH locked	11 to 14 V
3B-12 (LSFR) - Body ground	GR - Body ground	Front door RH unlock detection switch input	Front door RH unlocked	Below 1 V
3B-12 (LSFR) - Body ground	GR - Body ground	Front door RH unlock detection switch input	Front door RH locked	11 to 14 V
K53-18 (L2) - Body ground	LG - Body ground	Driver door key-linked lock input	Driver door key cylinder turned to lock position	Below 1 V
K53-18 (L2) - Body ground	LG - Body ground	Driver door key-linked lock input	Driver door key cylinder off	11 to 14 V
K53-17 (UL3) - Body ground	BE - Body ground	Driver door key-linked unlock input	Driver door key cylinder turned to unlock position	Below 1 V
K53-17 (UL3) - Body ground	BE - Body ground	Driver door key-linked unlock input	Driver door key cylinder off	11 to 14 V
3B-14 (LSWL) - Body ground	GR - Body ground	Rear door LH unlock detection switch input	Rear door LH unlocked	Below 1 V
3B-14 (LSWL) - Body ground	GR - Body ground	Rear door LH unlock detection switch input	Rear door LH locked	11 to 14 V
K51-20 (LSWR) - Body ground	L - Body ground	Rear door RH unlock detection switch input	Rear door RH unlocked	Below 1 V
K51-20 (LSWR) - Body ground	L - Body ground	Rear door RH unlock detection switch input	Rear door RH locked	11 to 14 V
3A-20 (SH) - Body ground	L - Body ground	Security horn assembly drive	Security horn assembly sounding (Theft deterrent system in alarm sounding state)	Pulse generation (Below 1 V ← → 11 to 14 V)
3C-27 (HORN) - Body ground	W - Body ground	Vehicle horns drive	Vehicle horns sounding (Theft deterrent system in alarm sounding state)	Pulse generation (Below 1 V ← → 11 to 14 V)
3C-31 (HRLY) - Body ground	V - Body ground	Headlight relay drive output	Low beams blinking (Theft deterrent system in alarm sounding state)	Pulse generation (Below 1 V ← → 11 to 14 V)
3B-29 (ILE) - Body ground	G - Body ground	Interior lights drive output	Interior lights illuminated (Theft deterrent system in alarm sounding state)	Below 1 V