ELECTRICAL SYSTEM AND TESTING
Troubleshooting
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
Page 11-37
11
TEST PROCEDURE 12 – ONBOARD COMPUTER GRAY WIRE AND FUSE
See General Warning, Section 10, Page 10-1.
1. With batteries connected and a multimeter set to 200 volts DC, connect the red (+) probe to the positive
post of battery no. 1 and black (–) probe (with insulation-piercing probe) to gray 16-gauge wire at a point
between fuse and receptacle (1). Reading should be approximately 40-45 volts. If reading is zero volts,
check gray wire fuse and fuse holder for continuity.
2. If the reading in step 1 is 48 volts, plug the DC cord into the vehicle’s charger receptacle. The voltage
reading should drop to approximately less than 5 volts before the charger relay clicks on.
3. When the charger relay is activated, the reading should rise to approximately 48 volts.
4. If voltage does not drop to less than 5 volts when the DC cord is plugged in and then rise to approximately
48 volts when the charger relay clicks on, the gray wire circuit in the OBC has failed. Replace the OBC.
TEST PROCEDURE 13 – VOLTAGE AT CHARGER RECEPTACLE RED WIRE
SOCKET
See General Warning, Section 10, Page 10-1.
(This procedure will determine if the 10-guage red wire used to charge the batteries has continuity.)
1. With batteries connected and a multimeter set to 200 volts DC, place the black (–) probe on the negative
post of battery no. 8 and place the red (+) probe on the charger receptacle socket connected to the red
10-gauge wire. The reading should be 48-50 volts (full battery voltage).
2. If the reading is zero volts, check the continuity of the 10-gauge red wire from the positive post of battery
no. 1 to the receptacle socket.
Figure 11-25 Test 12: OBC Grey Wire - External
Charger
Figure 11-26 Test 12: OBC Grey Wire - Onboard
Charger
1
1
