Component Testing

Coolant Pump Relay

1. Ignition OFF, disconnect the CAC coolant pump relay.
2. Test between the normally-closed switch terminals, if any, for 0 ohms.
3. Test between the normally-open switch terminals for infinite ohms.
4. Test between each switch terminal and either coil terminal for infinite ohms.
5. Connect the relay coil terminals to ground and fused power to energize the relay.
6. Test between each switch terminal and each coil terminal for 0 volts.
7. Test between the normally-closed switch terminals, if any, for infinite ohms.
8. Test between the normally-open switch terminals for 0 ohms.
   • If the relay fails any of the above tests, replace the relay.

CAC Pump Dynamic Test

1. Install a 10A fused jumper wire between the B+ terminal 2 and 12 volts.
2. Install a jumper wire between the ground terminal 1 and ground.
3. Observe for the CAC pump to activate.
   • If the CAC pump does not activate, replace the CAC pump