CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
*A | Main Body ECU (Multiplex Network Body ECU) with 2 Connectors | - | - |
*1 | Main Body ECU (Multiplex Network Body ECU) | - | - |
*a | 2 connectors | - | - |
*A | Main Body ECU (Multiplex Network Body ECU) with 3 Connectors | - | - |
*1 | Main Body ECU (Multiplex Network Body ECU) | - | - |
*a | 3 connectors | - | - |
Remove the main body ECU (multiplex network body ECU) from instrument panel junction block assembly.
Reconnect the instrument panel junction block assembly connectors.
Measure the resistance and voltage according to the value(s) in the table below.
Tech Tips
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 | - | Battery power supply | Always | 11 to 14 V |
MB-32 (IG) - Body ground | - | Ignition power supply (IG signal) | Ignition switch ON | 11 to 14 V |
Ignition switch off | Below 1 V | |||
MB-30 (ACC) - Body ground | - | Ignition power supply (ACC signal) | Ignition switch ACC | 11 to 14 V |
Ignition switch off | Below 1 V | |||
MB-11 (GND1) - Body ground | - | Ground | Always | Below 1 Ω |
F19-6 (FLCY) - Body ground | GR - Body ground | Front door courtesy light switch assembly (for LH) input | Front door LH closed (OFF) | 10 kΩ or higher |
Front door LH open (ON) | Below 1 Ω | |||
F19-27 (FRCY) - Body ground | L - Body ground | Front door courtesy light switch assembly (for RH) input | Front door RH closed (OFF) | 10 kΩ or higher |
Front door RH open (ON) | Below 1 Ω | |||
MB-13 (LCTY) - Body ground | - | Rear door courtesy light switch assembly (for LH) input | Rear door LH closed (OFF) | 10 kΩ or higher |
Rear door LH open (ON) | Below 1 Ω | |||
MB-2 (RCTY) - Body ground | - | Rear door courtesy light switch assembly (for RH) input | Rear door RH closed (OFF) | 10 kΩ or higher |
Rear door RH open (ON) | Below 1 Ω | |||
MB-4 (BCTY) - Body ground | - | Back door courtesy light switch input | Back door closed (OFF) | 10 kΩ or higher |
Back door open (ON) | Below 1 Ω | |||
F18-27 (GCTY) - Body ground*1 | R - Body ground | Glass hatch courtesy light switch input | Glass hatch closed (OFF) | 10 kΩ or higher |
Glass hatch opened (ON) | Below 1 Ω | |||
F19-11 (HCTY) - Body ground | B - Body ground | Engine hood courtesy switch input | Engine hood open (OFF) | 10 kΩ or higher |
Engine hood closed (ON) | Below 1 Ω | |||
MB-3 (KSW) - Body ground*2 | - | Unlock warning switch input | Key not in ignition key cylinder (OFF) | 10 kΩ or higher |
Key in ignition key cylinder (ON) | Below 1 Ω |
*1: w/ Power Back Door System
*2: w/o Smart Entry and Start System
Install the main body ECU (multiplex network body ECU) to instrument panel junction block assembly.
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 |
---|---|---|---|---|
4D-10 (LSFL) - Body ground | GR - Body ground | Front door LH unlock detection switch input | Front door LH unlocked | Below 1 V |
Front door LH locked | Pulse generation (11 to 14 V) |
|||
4D-26 (LSFR) - Body ground | Y - Body ground | Front door RH unlock detection switch input | Front door RH unlocked | Below 1 V |
Front door RH locked | Pulse generation (11 to 14 V) |
|||
4H-34 (LSWL) - Body ground | V - Body ground | Rear door LH unlock detection switch input | Rear door LH unlocked | Below 1 V |
Rear door LH locked | Pulse generation (11 to 14 V) |
|||
F18-2 (LSWR) - Body ground | LG - Body ground | Rear door RH unlock detection switch input | Rear door RH unlocked | Below 1 V |
Rear door RH locked | Pulse generation (11 to 14 V) |
|||
F19-29 (L2) - Body ground | V - Body ground | Driver door key-linked lock input | Driver door key cylinder turned to lock position | Below 1 V |
Driver door key cylinder off | Pulse generation (11 to 14 V) |
|||
F19-2 (UL3) - Body ground | SB - Body ground | Driver door key-linked unlock input | Driver door key cylinder turned to unlock position | Below 1 V |
Driver door key cylinder off | Pulse generation (11 to 14 V) |
|||
F19-15 (IND) - Body ground* | GR - Body ground | Security indicator illumination | Security indicator light illuminated (Theft deterrent system in alarm sounding state) |
3 to 10 V |
4F-31 (SH) - Body ground | L - Body ground | Security horn assembly drive | Security horn assembly sounding (Theft deterrent system in alarm sounding state) |
Below 1 V |
4F-29 (HORN) - Body ground | G - Body ground | Vehicle horn drive | Vehicle horns sounding (Theft deterrent system in alarm sounding state) |
Below 1 V |
*: w/o Smart Entry and Start System