Intermittent fault

Check the cable between control module terminal #12 and water pump terminal 1. Check for an intermittent short-circuit to supply voltage.

Remedy as necessary.

Other information:

To access the control module or connect the breakout box, see Connecting the breakout box
To access or replace the water pump, see Replacing the water pump for the engine coolant heater
With the ignition on and the water pump connector disconnected, the voltage between water pump terminal 1 (control module side) and ground should be approximately 0 V
For other values, see Signal specification
See Checking wiring and terminals .

Fig 1: Identifying 2-Bit Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.