E39 / P0689 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE
Main Relay Circuit. No Voltage to Control Module.
Fault symptom
CHECK ENGINE
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| The voltage through the main relay is lower than 5V when the relay is activated. |
| Voltage via main relay is greater than 18 V. |
Checking the wiring harness
| • | Faults in the control module female connector can be the cause of the DTC. Check the connector with respect to oxidation, depressed pins and pin clamping force. |
| • | Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force. |
Diagnostic help
Diagnosis regards:
Functions in the diagnostic tool related to the fault:
| (See also description of readings/activations in diagnostic tool) |
