Rear Window Defogger Relay Test
REAR WINDOW DEFOGGER RELAY TEST
| POTENTIAL PROBLEM | SYSTEM ON OR OFF WITH ENGINE RUNNING | VOLTAGE AT REAR WINDOW DEFOGGER RELAY POINT TO GOOD VEHICLE GROUND | VOLTAGE AT REAR WINDOW DEFOGGER GRID TO GOOD VEHICLE GROUND | ||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | A | B | ||
| NO PROBLEM. VOLTAGES AS EXPECTED WITH THE SYSTEM OFF. | OFF | MORE THAN 11 | MORE THAN 11 | 0 | MORE THAN 11 | 0 | 0 |
| NO PROBLEM. VOLTAGES AS EXPECTED WITH THE SYSTEM ON. | ON | MORE THAN 11 | MORE THAN 11 | MORE THAN 11 | LESS THAN 1.0 | MORE THAN 11 | LESS THAN 1.0 |
| RELAY CONTACTS NOT CLOSING. REPLACE RELAY. | ON | MORE THAN 11 | MORE THAN 11 | 0 | LESS THAN 1.0 | 0 | 0 |
| WIRING OPEN BETWEEN BODY CONTROL MODULE AND REAR WINDOW DEFOGGER RELAY, OR, DEFECTIVE BODY CONTROL MODULE. | ON | MORE THAN 11 | MORE THAN 11 | 0 | MORE THAN 11 | 0 | 0 |
| POOR CONNECTION BETWEEN PIN 3 OF RELAY AND POSITIVE CONNECTION ON REAR WINDOW DEFOGGER GRID CIRCUIT. | ON | MORE THAN 11 | MORE THAN 11 | MORE THAN 11 | LESS THAN 1.0 | 0 | 0 |
| POOR CONNECTION TO GROUND ON NEGATIVE SIDE OF REAR WINDOW DEFOGGER GRID. | ON | MORE THAN 11 | MORE THAN 11 | MORE THAN 11 | LESS THAN 1.0 | MORE THAN 11 | MORE THAN 11 |
| POOR WIRING CONNECTION BETWEEN PINS 1 TO 2 OF THE REAR WINDOW DEFOGGER RELAY. | ON | MORE THAN 11 | 0 | 0 | 0 | 0 | 0 |
| OPEN FUSE OR OPEN WIRING CONNECTION TO PIN 1 OF REAR WINDOW DEFOGGER RELAY. | ON | 0 | 0 | 0 | 0 | 0 | 0 |
| RELAY CONTACTS SHORTED. REPLACE RELAY. REAR WINDOW DEFOGGER WILL NOT TURN OFF. | OFF | MORE THAN 11 | MORE THAN 11 | MORE THAN 11 | MORE THAN 11 | MORE THAN 11 | 0 |