PSG16 / P0670 F6
Read the instructions below then 
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
	
Glow Control Unit. Short to B+

Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| Output short circuit to B+ for more than 0.6 s. | 
System reaction to a fault:
| Control module output switched off. | 
OK report:
| Fault criteria NOT fulfilled for 0.6 s. | 
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
Data link from glow plug control module should switch high/low inversely to activation lead from PSG 16 to glow plug control module.