Checking Program - Electrical Circuit QWS
| Test | Test Equipment | Test | Notes | Nominal | ||
|---|---|---|---|---|---|---|
| Step | Multimeter | |||||
| MKM - 587 - A | of | between | Value | |||
| 04a | Voltmeter range 20V, DC | QWS switch S144 (All except Campo / Brava 4JA1 and Monterey) | K129, ter. 4 and ter. 6 (ter. 3 for 4JG2 and 4JA1 - T) | Ground | · Reconnect wiring harness plug to QWS switch S144 |
· Bridge ambient temperature switch wiring harness plug
· Remove relay QWS K129 from relay socket
| · Ignition "ON" | ||||
|---|---|---|---|---|
| · QWS switch "ON" | > 11.5 V | |||
| · QWS switch "OFF" | ||||
| · Measurements at relay socket | 0 V | |||
| Troubleshooting: | Nominal Value: | Cause of Fault: |
· Ignition "OFF"
· Disconnect wiring harness plug from QWS switch S144
· Measure resistance with multimeter
| from: QWS switch S144, wiring harness plug ter. 5 (ter. 3 for Frontera) | ||
|---|---|---|
| to: Relay QWS K129, relay socket ter. 3 (ter. 6 for Frontera) and ter. 4 | approx. 0 W | · Line interrupted or short circuit to voltage |
from: QWS switch S144, wiring harness plug ter. 5 (ter. 3 for Frontera)
to: Relay QWS K129, relay socket ter. 3 (ter. 6 for Frontera) and ter. 4
· Measure resistance with multimeter
from: Relay QWS K129, relay socket ter. 3 (ter. 6 for Frontera)
| to: Relay QWS K129, relay socket ter. 4 | approx. 0 W | · Line interrupted |
from: Relay QWS K129, relay socket ter. 3 (ter. 6 for Frontera)
to: Relay QWS K129, relay socket ter. 4
| If nominal values are attained: | QWS switch S144 defective |