Pin Voltage Tests
Instrument panel Electronic Control Unit (ECU) is located behind center of instrument panel and contains 22-pin connector "A", 18-pin connector "B", and 14-pin connector "C". See Figure and Fig 1 . Most of the wires for the instrument panel ECU/Body Control Systems wiring harness are Sky Blue. Except for some early production models, these wires are marked with a terminal number for identification.
Always verify proper connectors, and proper connector terminals when performing PIN VOLTAGE TESTS. See WIRING DIAGRAMS . Ensure proper pins are used on instrument panel ECU when performing pin voltage tests. Ensure pin voltage values are within specification. See INSTRUMENT PANEL ECU PIN VOLTAGE TEST .
INSTRUMENT PANEL ECU PIN VOLTAGE TEST
| Check Between Terminals (1) | Condition | Voltage | ||
|---|---|---|---|---|
| A1-C4 | Doors Are Opened | Less Than 1 | ||
| All Doors Are Closed | 10-14 | |||
| A2-C4 | Doors Are Opened | Less Than 2 | ||
| All Doors Are Closed | 10-14 | |||
| A3-C4 | Passenger Door Closed | 10-14 | ||
| Passenger Door Opened | Less Than 1 | |||
| A4-C4 | Driver Door Lock Control Switch In OFF Position | 10-14 | ||
| Driver Door Lock Control Switch In LOCK Position | Less Than 1 | |||
| A5-C4 | Passenger Door Lock Control Switch In OFF Position | 10-14 | ||
| Passenger Door Lock Control Switch In LOCK Position | Less Than 1 | |||
| A6-C4 | Driver Door Key Lock/Unlock Switch In OFF Position | Less Than 1 | ||
| Driver Door Key Lock/Unlock Switch In LOCK Position | 10-14 | |||
| A7-C4 | Passenger Door Key Lock/Unlock Switch In OFF Position | Less Than 1 | ||
| Passenger Door Key Lock/Unlock Switch In LOCK Position | 10-14 | |||
| A8-C4 | Driver Door Lock Control Switch In OFF Position | Less Than 1 | ||
| A9-C4 | Passenger Door Lock Control Switch In OFF Position | 10-14 | ||
| Passenger Door Lock Control Switch In LOCK Position | Less Than 1 | |||
| A10-C4 | Passenger Door Key Lock/Unlock Switch In OFF Position | Less Than 1 | ||
| Passenger Door Key Lock/Unlock Switch In UNLOCK Position | 10-14 | |||
| A11-C4 | Driver Door Key Lock/Unlock Switch In OFF Position | Less Than 1 | ||
| Driver Door Key Lock/Unlock Switch In LOCK Position | 10-14 | |||
| A13-C4 | At All Times | 10-14 | ||
| A14-C4 | Driver Door Closed | 10-14 | ||
| Driver Door Opened | Less Than 1 | |||
| A15-C4 | Ignition On & Headlights On | Less Than 2 | ||
| Ignition On & Headlights Off | 10-14 | |||
| A16-C4 | Rear Wiper Switch In OFF, LO, Or HI Position | 10-14 | ||
| Rear Wiper Switch In INT AUTO Position | Less Than 1 | |||
| A17-C4 | Rear Wiper Switch In OFF, INT AUTO, Or LO Position | 10-14 | ||
| Rear Wiper Switch In HI Position | Less Than 1 | |||
| A18-C4 | Headlight Switch In TAIL Position | Less Than 1 | ||
| Headlight Switch In Any Position Except TAIL | 10-14 | |||
| A19-C4 | Headlight Switch In HEAD Position | Less Than 1 | ||
| Headlight Switch In Any Position Except HEAD | 10-14 | |||
| A20-C4 | Key Inserted In Ignition Switch | Less Than 1 | ||
| Key Is Not Inserted In Ignition Switch | 10-14 | |||
| A21-C4 | Ignition Switch In ACC Position | 10-14 | ||
| B18-C4 | Driver Door Locked | 10-14 | ||
| Driver Door Unlocked | Less Than 1 | |||
| B1-C4 | Right Rear Door Is Opened | Less Than 1 | ||
| Right Rear Door Is Closed | 10-14 | |||
| B2-C4 | Brake Is On | 10-14 | ||
| Brake Is Off | Less Than 1 | |||
| B5-C4 | Rear Door Is Locked | 10-14 | ||
| Rear Door Is Unlocked | Less Than 1 | |||
| B6-C4 | Passenger Door Is Locked | 10-14 | ||
| Passenger Door Is Unlocked | Less Than 1 | |||
| B10-C4; B11-C4; B12-C4; B13-C4; B15-C4 | At All Times | 10-14 | ||
| C1-C4; C8-C4; C11-C4 | At All Times | 10-14 | ||
| C2-C4; C3-C4 | Ignition Switch In ON Position | 10-14 | ||
| C4-Ground; C6-Ground | At All Times | Less Than 1 | ||
| C7-C4 | Left Rear Door & Back Door Are Open | Less Than 1 | ||
| Left Rear Door & Back Door Are Closed | 10-14 | |||
| C9-C4 | Ignition On & Headlight Switch In OFF Position | 10-14 | ||
| C12-C4 | During Rear Wiper Operation | Less Than 1 | ||
| When Rear Wipers At A Stop | 10-14 | |||
| C14-C4 | Shifter In "P" | Less Than 1 | ||
| Shifter In Any Position Except "P" | 10-14 | |||
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