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Heater Control Power and Ground Circuits Troubleshooting
1. Check the No. 54 (40A) fuse in the under-hood fuse/
relay box, the No. 3 (7.5A) fuse in the driver's
under-dash fuse/relay box, and the No. 13 (7.5A)
fuse in the passenger's under-dash fuse/relay box.
Are the fuses
OK?
Y E S — G o t o step 2.
NO — Replace the fuse(s), and recheck. •
2. Disconnect the heater control panel 22P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 2 terminal of
the heater control panel 22P connector and body
g r o u n d .
H E A T E R C O N T R O L P A N E L 2 2 P C O N N E C T O R
W i r e s i d e o f f e m a l e t e r m i n a l s
B L K / Y E L
1
2
3
4
5
6
7
8
9
10
11
12
— i
13
14
15
16
X
17
18
19
2 0
21
2 2
Is there battery
voltage?
Y E S - G o t o step 5.
NO—Repair open in the w i r e between the No. 3
fuse in the driver's under-dash fuse/relay box and
the heater control panel. •
5. Turn the ignition switch OFF.
6. Measure the voltage between the No. 3 terminal of
the heater control panel 22P connector and body
g r o u n d .
H E A T E R C O N T R O L P A N E L 22P C O N N E C T O R
W i r e s i d e o f f e m a l e t e r m i n a l s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
X
17
18
19
20
21 22
Is there battery
voltage?
Y E S - G o t o step 7.
NO—Repair open in the w i r e between the No. 13
fuse in the passenger's under-dash fuse/relay box
and the heater control panel. •
7. Check f o r continuity between the No.9 terminal of
the heater control panel 22P connector and body
g r o u n d .
H E A T E R C O N T R O L P A N E L 22P C O N N E C T O R
W i r e s i d e o f f e m a l e t e r m i n a l s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
X
17
18
19
20
21 22
Is there
continuity?
Y E S —Check f o r loose wires or poor connections at
the heater control panel 22P connector. If the
connections are g o o d , substitute a known-good
heater control panel, and recheck. If the s y m p t o m /
indication goes away, replace the original heater
control panel. •
NO —Check f o r an open in the wire between the
heater control panel and body ground. If the w i r e is
OK, check for poor g r o u n d at G401. •
21-19
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Table of Contents
Troubleshooting
