VTM-4 Control Unit Inputs and Outputs
WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
The VTM-4 control unit terminal voltage and measuring conditions for the 4WD system are shown.
NOTE:
Measure voltage with the connectors connected.
CONNECTOR TERMINAL REFERENCE CHART
| Terminal number | Wire color | Terminal name | Description | Measurement | |
|---|---|---|---|---|---|
| Conditions | Voltage | ||||
| A1 | YEL | IG1 (Ignition 1) | Power supply for activating the system | Ignition switch ON (II) | Battery Voltage |
| A3 | GRY/RED | RRP (Rear right pulse) | Detect right-rear wheel sensor signal | Turn wheel at 1 rotation/second | There should be 0 to about 5 V repeatedly. (A digital voltmeter reads about 2.5 V when the wheel is turning faster.) |
| A4 | ORN/GRN | FSR (Fail-safe relay) | Drives VTM-4 relay | Ignition switch ON (II) | Battery Voltage |
| Engine running | Less than 1 V | ||||
| A5 | GRY/YEL | RLP (Rear left pulse) | Detects left-rear wheel sensor signal | Turn wheel at 1 rotation/second | There should be 0 to about 5 V repeatedly. (A digital voltmeter reads about 2.5 V when the wheel is turning faster.) |
| A6 | GRN/RED | PARBRK (Parking brake) | Detects parking brake signal | Parking brake on | Less than 2 V |
| Parking brake off | Battery Voltage | ||||
| A7 | LT GRN | FRP (Front right pulse) | Detects right-front wheel sensor signal | Turn wheel at 1 rotation/second | There should be 0 to about 5 V repeatedly. (A digital voltmeter reads about 2.5 V when the wheel is turning faster.) |
| A8 | BRN/WHT | LOCKSW (LOCK switch) | Detects VTM-4 LOCK switch signal | Ignition switch ON (II) | Less than 1 V |
| VTM-4 LOCK switch ON (pushed in) | Battery Voltage | ||||
| A9 | WHT/RED | FLP (Front left pulse) | Detects left-front wheel sensor signal | Turn wheel at 1 rotation/second | There should be 0 to about 5 V repeatedly. (A digital voltmeter reads about 2.5 V when the wheel is turning faster.) |
| A10 | BRN/YEL | LG1 (Logic ground) | Ground | Less than 1 V | |
| A11 | WHT | CANH (CAN communication signal high) | CAN communication signal | Ignition switch ON (II) | About 2.5 V (pluses) |
| A12 | BLU | NEP (Engine speed pulse) | Detects engine speed pulse | Ignition switch ON (II) | Above 8 V |
| Engine running at 1,000 rpm | 5-8 V | ||||
| A13 | BLK | TOL (Temperature oil low) | Detects rear differential fluid temperature sensor signal | Check at normal temperature with the ignition switch ON (II) | 1-3.6V |
| A14 | RED/WHT | WARN1 (Warning 1) | Drives VTM-4 indicator | VTM-4 indicator on | Less than 4V |
| VTM-4 indicator off | Battery Voltage | ||||
| A15 | WHT | TOH (Temperature oil high) | Power supply for rear differential fluid temperature sensor | Ignition switch ON (II) | 4-5 V |
| A16 | YEL/BLK | LOCKL (Lock lamp) | Drives VTM-4 LOCK indicator | VTM-4 LOCK indicator on | Less than 4 V |
| VTM-4 LOCK indicator off | Battery Voltage | ||||
| A18 | GRY | K-LINE | Communication signal to HDS | Ignition switch ON (II) (Not connected to HDS) | About 9.0 V |
| A20 | BRN | SCS (Service check signal) | Detects service check signal | SCS circuit shorted | Less than 2 V |
| SCS circuit opened | About 5 V | ||||
| A22 | RED | CANL (CAN communication signal low) | CAN communication signal | Ignition switch ON (II) | About 2.5 V (pluses) |
| B1 | BLU/YEL | LCOH (Left coil high) | Drives left clutch electromagnetic coil (positive) | Ignition switch ON (II) | Less than 1 V |
| Engine running | Less than 1 V | ||||
| VTM-4 LOCK switch ON (pushed in) | Above 3 V | ||||
| B2 | GRY/WHT | LCOL (Left coil low) | Drives left clutch electromagnetic coil (negative) | Ignition switch ON (II) | Less than 1 V |
| Engine running | Less than 1 V | ||||
| VTM-4 LOCK switch ON (pushed in) | Less than 1V | ||||
| B3 | BRN/BRK | RCOH (Right coil high) | Drives right clutch electromagnetic coil (positive) | Ignition switch ON (II) | Less than 1 V |
| Engine running | Less than 1 V | ||||
| VTM-4 LOCK switch ON (pushed in) | Above 3 V | ||||
| B4 | RED/GRN | RCOL (Right coil low) | Drives right clutch electromagnetic coil (negative) | Ignition switch ON (II) | Less than 1 V |
| Engine running | Less than 1V | ||||
| VTM-4 LOCK switch ON (pushed in) | Less than 1 V | ||||
| B5 | BLK | PG (Power ground) | Ground | Less than 0.5 V | |
| B7 | RED/BLU | PWR (Power) | Power supply for VTM-4 control unit | 10 seconds after ignition switch ON (II) | Less than 3 V |
| Engine running | Battery Voltage | ||||
| VTM-4 LOCK switch ON (pushed in) | Battery Voltage | ||||
| B11 | RED/WHT | WARN2 (Warning 2) | Drives VTM-4 indicator | VTM-4 indicator on | Less than 4 V |
| VTM-4 indicator off | Battery Voltage | ||||
| B12 | BRN/YEL | LG2 (Logic ground) | Ground | Less than 1 V | |