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IQ PLUS CHARGER (ONBOARD)
Troubleshooting
2008-2011 Domestic Battery Charger Maintenance and Service Manual
Page 9-7
9
ý
WARNING
• Knowledge of battery charger wiring and component terminology is required before
attempting any repair (Figure 9-3, Page 9-6).
• Prior to servicing the charger, disconnect the AC power supply cord from the wall outlet and
remove the battery charger from the vehicle. See Onboard Charger Removal on page 9-31.
Use the following Troubleshooting Guide for troubleshooting the IQ Plus onboard battery charger (model
numbers 25260-11 and 25260-50). The Troubleshooting Guide encompasses the entire battery charging cir-
cuit. Test procedures specified in the Troubleshooting Guide can be found on the following pages.
IQ PLUS ONBOARD BATTERY CHARGER TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Relay does not close, no transformer
hum and ammeter does not move
Batteries disconnected
Connect the batteries.
See Connecting
The Batteries on page 1-4.
Battery voltage is too low
Test Procedure 1 – Battery Voltage on
page 9-9
Improper vehicle or battery charger wiring
See
Figure 9-2, Page 9-3
,
Figure 9-3,
Page 9-6 and
Figure 9-4, Page 9-10
DC circuit
Test Procedure 5 – Charger DC Circuit
Continuity Test on page 9-14
Onboard computer malfunction
Test Procedure 2 – Control Board on
page 9-11
Gray sense lead fuse is blown
Test Procedure 1 – Battery Voltage on
page 9-9
Control board malfunction
Test Procedure 2 – Control Board on
page 9-11
Relay closes with an audible click but
no transformer hum and ammeter does
not move
Improper AC line voltage
Test Procedure 3 – AC Power and
Continuity Check of AC Circuit on
page 9-12
Failed AC plug and cord
Test Procedure 3 – AC Power and
Continuity Check of AC Circuit on
page 9-12
Failed AC cord reel
Test Procedure 8 – Continuity on
page 9-17
Internal AC breaker
Test Procedure 3 – AC Power and
Continuity Check of AC Circuit on
page 9-12
Transformer primary coil
Test Procedure 6 – Transformer on
page 9-15
Relay
Test Procedure 8 – Continuity on
page 9-17
Relay closes and transformer hums but
ammeter does not move
Blown charger fuse
Test Procedure 4 – Diodes on page 9-13
Both Diodes failed
Test Procedure 4B – Both Diodes Failed
on page 9-14
Onboard computer malfunction
Test Procedure 2 – Control Board on
page 9-11
Failed transformer
Test Procedure 6 – Transformer on
page 9-15
Failed ammeter
Replace ammeter
Troubleshooting Guide continued on next page...
Summary of Contents for 2008-2011
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