Backlighting Diagnosis
Test
No.
Test
Test Procedure
Test Result
Action
4
Check circuits DIM+
and GND1 to override
switch.
Disconnect the override switch
connector.
Turn headlights on.
Measure voltage at pins 10(+)
and 8(–) of the override switch
connector.
9–16V
Replace the override switch,
then
go to test no. 5
.
Less than 9V (0V)
Check circuits DIM+ and GND1
between the override switch and
AS2 connectors for circuit faults
(open or short). Repair as
necessary, then
go to test no.
5
.
5
Verify repair.
Verify that repair solved the
backlighting problem.
Problem resolved.
Done.
Problem unresolved.
Repeat test no. 1
.
Table 10, Backlighting Diagnosis
Sleeper Climate Control Panel
Circuit Diagnosis
See
for sleeper climate control panel circuit
diagnosis.
Sleeper Climate Control Panel Circuit Diagnosis
Test
No.
Test
Test Procedure
Test Result
Action
1
Does the symptom
involve both the
blower and
temperature control?
—
No, affects only one of
these
Go to test no. 4
.
Yes, affects both
Go to test no. 2
.
2
Check the 12VDC
ignition supply to the
control panel.
Gain access to the back of the
sleeper control panel.
Disconnect the blower and
temperature potentiometer
connectors.
Turn the ignition on.
At the blower speed
potentiometer connector, check
for voltage at pin A (circuit 98N).
Repeat test for temperature
potentiometer connector pin A
(circuit 98N).
Voltage at both pins
Go to test no. 3
.
Voltage at only one pin
Check circuit 98N between
connector with no voltage and
splice in harness. Repair as
necessary.
No voltage at either pin Check 10A fuse in B-pillar PDM.
If blown, check for short in circuit
98N. If okay, check circuit 98N
for open and check ignition
supply to fuse panel. Repair as
necessary.
Heater and Air Conditioner Troubleshooting
83.00
Symptom Driven Diagnosis
122SD and Coronado Workshop Manual, Supplement 9, June 2014
350/23
