DOOR COURTESY SWITCH CIRCUIT (BACK)
Note. This procedure is for the IS 300 wagon model.
DOOR COURTESY SWITCH CIRCUIT (LUGGAGE COMPARTMENT)
Note. This procedure is for the IS 300 sedan model.
IGNITION SWITCH POWER SOURCE CIRCUIT
Note. There is a 12-pin driver side junction block-to-body ECU connector that is ONLY accessible after separation from the junction block.
OPENER RELAY & MOTOR (BACK DOOR)
Note. This procedure is for the IS 300 wagon model.
OPENER RELAY & MOTOR (LUGGAGE COMPARTMENT)
Note. This procedure is for the IS 300 sedan model.
POWER SOURCE CIRCUIT
Note. There is a 12-pin driver side junction block-to-body ECU connector that is ONLY accessible after separation from the junction block.
PIN VOLTAGE TESTS
Note. There is a 12-pin driver side junction block-to-body ECU connector that is ONLY accessible after separation from the junction block.
Using a DVOM connected to ground, backprobe to measure voltage or resistance at appropriate terminal at body ECU harness connector unless otherwise specified. See CONNECTOR IDENTIFICATION . See BODY ECU PIN VOLTAGE CHART table.
| Terminal No. (Symbol), Wire Color | Condition | Standard Voltage |
|---|---|---|
| 1 (BSUB) - 12 (GND) | Constant | 10-14 Volts |
| 2 (BECU) - 12 (GND) | Constant | 10-14 Volts |
| 3 (IG) - 12 (GND) | Ignition Switch Position Is LOCK Or ACC | Less Than 1 Volt |
| 3 (IG) - 12 (GND) | Ignition Switch Position Is ON | 10-14 Volts |
| 4 (ACC) - 12 (GND) | Ignition Switch Position Is LOCK | Less Than 1 Volt |
| 4 (ACC) - 12 (GND) | Ignition Switch Position Is ACC | 10-14 Volts |
| 5 (DFG) - 12 (GND) | Defogger Switch Position Is ON | Less Than 1 Volt |
| 6 (MPX3) | Multiplex Communication Circuit | — |
| 7 (MPX1) - B6-5 (MPX2), Orange | Multiplex Communication Circuit | — |
| 8 (ILE) - 12 (GND) | Each Interior Light Switch ON | Less Than 1 Volt |
| 9 (ACT+) - 10 (ACT-) | Door Lock Operating | 10-14 Volts |
| 11 (BCTY) - 12 (GND) | Driver Door Opened | Less Than 1 Volt |
| 11 (BCTY) - 12 (GND) | Driver Door Closed | 10-14 Volts |
| 12 (GND) - Body Ground | Constant | Less Than 1 Volt |
| B5-1 (PRG) - B5-2 (RDA), Red/Black - Gray/Blue | Wireless Door Lock Receiver Communication Circuit | — |
| B5-3 (DBKL) - B6-19 (GND2), Pink/Black - White/Black | With Seat Belt ON | Less Than 1 Volt |
| B5-3 (DBKL) - B6-19 (GND2), Pink/Black - White/Black | No Seat Belt ON | 10-14 Volts |
| B5-4 (LSR) - B6-19 (GND2), Blue/Red - White/Black | Rear Door Is Unlocked | Less Than 1 Volt |
| B5-4 (LSR) - B6-19 (GND2), Blue/Red - White/Black | Rear Door Is Locked | Approx. 5.7 Volts |
| B5-5 (RCTY) - B6-19 (GND2), Red/Blue - White/Black | Rear Door Opened | Less Than 1 Volt |
| B5-5 (RCTY) - B6-19 (GND2), Red/Blue - White/Black | Rear Door Closed | 10-14 Volts |
| B5-6 (DCTY) - B6-19 (GND2), Red/Green - White/Black | Driver Door Opened | Less Than 1 Volt |
| B5-6 (DCTY) - B6-19 (GND2), Red/Green - White/Black | Driver Door Closed | 10-14 Volts |
| B5-7 (LGCY) - Body Ground, Red/Yellow (1) | Luggage Door Closed | 10-14 Volts |
| B5-7 (LGCY) - Body Ground, Red/Yellow (1) | Luggage Door Opened | Less Than 1 Volt |
| B7-7 (LGCY) - B6-19 (GND2), Red/Yellow - White/Black (2) | Back Door Opened | Less Than 1 Volt |
| B7-7 (LGCY) - B6-19 (GND2), Red/Yellow - White/Black (2) | Back Door Closed | 10-14 Volts |
| B5-8 (TR+) - B6-19 (GND2), Blue/White - White/Black (1) | Luggage Compartment Door Opener Switch Is Not Operated | 10-14 Volts |
| B5-8 (TR+) - B6-19 (GND2), Blue/White - White/Black (1) | Luggage Compartment Door Opener Switch Is Operated | Less Than 1 Volt |
| B7-8 (TR+) - B6-19 (GND2), Blue/White - White/Black (2) | Back Door Opener Switch Is Operated | Less Than 1 Volt |
| B7-8 (TR+) - B6-19 (GND2), Blue/White - White/Black (2) | Back Door Opener Switch Is Not Operated | 10-14 Volts |
| B5-9 (RLU) - B6-19 (GND2), Red - White/Black | Rear Left Side Power Window UP Operation | Less Than 1 Volt |
| B5-10 (RLD) - B6-19 (GND2), Green/Black - White/Black | Rear Left Side Power Window DOWN Operation | Less Than 1 Volt |
| B5-14 (FR) - B5-13 (FE), Yellow/Red - Brown/White | Ignition Switch Position ON & Fuel Sender Gauge Position Float UP | Approx. 0.5 Volt |
| B5-14 (FR) - B5-13 (FE), Yellow/Red - Brown/White | Ignition Switch Position ON & Fuel Sender Gauge Position Float DOWN | Approx. 0.5 Volt |
| B6-1 (OBDII) - B6-19 (GND2), White - White/Black | OBDII Communication Circuit | — |
| B6-2 (TAIL) - B6-19 (GND2), Green - White/Black | Light Control Switch Position Is TAIL Or HEAD | Less Than 1 Volt |
| B6-2 (TAIL) - B6-19 (GND2), Green - White/Black | Light Control Switch Position Is OFF | 10-14 Volts |
| B6-3 (RRU) - B6-19 (GND2), Red/Yellow - White/Black | Rear Right Side Power Window UP Operation | Less Than 1 Volt |
| B6-4 (RRD) - B6-19 (GND2), Green/Yellow - White/Black | Rear Right Side Power Window DOWN Operation | Less Than 1 Volt |
| B6-6 (KSW) - B6-19 (GND2), Black/Yellow - White/Black | Key Is Inserted | Less Than 1 Volt |
| B6-6 (KSW) - B6-19 (GND2), Black/Yellow - White/Black | Key Is Not Inserted | 10-14 Volts |
| B6-7 (PML) - B6-19 (GND2), Green/Red - White/Black | Door Lock Control SW Is LOCK | 10-14 Volts |
| B6-7 (PML) - B6-19 (GND2), Green/Red - White/Black | Door Lock Control SW Is OFF Or UNLOCK | Less Than 1 Volt |
| B6-8 (PCTY) - B6-19 (GND2), Red/Black - White/Black | Passenger Door Opened | Less Than 1 Volt |
| B6-8 (PCTY) - B6-19 (GND2), Red/Black - White/Black | Passenger Door Closed | 10-14 Volts |
| B6-9 (PMUL) - B6-19 (GND2), Green/Black - White/Black | Door Lock Control SW Is OFF Or UNLOCK | Less Than 1 Volt |
| B6-9 (PMUL) - B6-19 (GND2), Green/Black - White/Black | Door Lock Control SW Is LOCK | 10-14 Volts |
| B6-10 (HAZ) - B6-19 (GND2), Green/White - White/Black | Hazard Warning Switch Position Is ON | Less Than 1 Volt |
| B6-11 (DCLP) - B6-19 (GND2), Red/Green - White/Black | Each Interior Light Switch ON | Less Than 1 Volt |
| B6-12 (PCLP) - B6-19 (GND2), Red - White/Black | Each Interior Light Switch ON | Less Than 1 Volt |
| B6-13 (BDSU) - B6-19 (GND2), Black/Red - White/Black | Back Door Opener Switch ON | Less Than 1 Volt |
| B6-13 (BDSU) - B6-19 (GND2), Black/Red - White/Black | Back Door Opener Switch OFF | 10-14 Volts |
| B6-14 (LSWP) - B6-19 (GND2), Blue/Red - White/Black | Passenger Door Is Unlocked | Less Than 1 Volt |
| B6-14 (LSWP) - B6-19 (GND2), Blue/Red - White/Black | Passenger Door Is Locked | 10-14 Volts |
| B6-16 (BZR) - B6-15 (BZR2), Blue/Yellow - Blue/Orange | Buzzer Is Sounded | 8-10 Volts |
| B6-16 (BZR) - B6-15 (BZR2), Blue/Yellow - Blue/Orange | Buzzer Is Not Sounded | Less Than 1 Volt |
| B6-17 (PU) - B6-19 (GND2), Yellow/Black - White/Black | Front Left Side Power Window UP Operation | Less Than 1 Volt |
| B6-18 (PD) - B6-19 (GND2), Blue/White - White/Black | Front Left Side Power Window DOWN Operation | Less Than 1 Volt |
| B6-19 (GND2) - Body Ground, White/Black | Constant | Less Than 1 Volt |
| B6-20 (ACTD) - 9 (ACT+), Red/White | Driver Door Is Operating | 10-14 Volts |
| (1) Sedan (2) Wagon | ||
| (1) | Sedan |
| (2) | Wagon |
BODY ECU PIN VOLTAGE CHART