Checking the Operating Thermostat Wiring

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.

Fig 2: Identifying Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.
- Connect an ohmmeter to the green/red cable between terminal 5 at the control module 8-pin connector and the operating thermostat.
- Connect an ohmmeter to the green/yellow cable between terminal 9 at the control module 2-pin connector and the operating thermostat.
Fig 4: Identifying Thermostat
Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 Ω on both the measurements.

OK
Refer to Verify
NOT OK
Refer to Checking For An Open-Circuit