ELECTRICAL
10.10
Characteristic
MIN
TYP
MAX
UNIT
Note
STARTER Output
Current
6
Amp
Current capability of the STARTER output
TRANS
Neutral Voltage
4.5
--
16
Vdc
BRAKE On
Input Voltage
2
14
16
Vdc
Voltage on BRAKE input to activate the STARTER
output
REVERSE POLARITY PROTECTION
Battery Reverse Current
1.8
2
mA
Max reverse leakage current when connected in
reverse
Reverse Bias Voltage
--55
Vdc
Absolute maximum reverse voltage before device
breakdown
TEMPERATURE CONTROLLER
Open Thermistor
Resistance
50k
ohm
Above this resistance is assumed to be an open
thermistor, causing the FAN and HOT indicator to
activate
Fan OFF Resistance
3362
3466
3570
ohm
Thermistor resistance above this value will turn off
the fan
Fan ON Resistance
2426
2519
2612
ohm
Thermistor resistance below this value will turn on
the fan
Engine Temperature In-
dicator ON Resistance
1534
1607
1680
ohm
Thermistor resistance below this value will cause
the HOT indicator output to pull low
Engine Temperature In-
dicator OFF Resistance
1534
1607
1680
ohm
Thermistor resistances above this value will not
activate the HOT inidicator output
’HOT’ LIGHT OPERATION
With the ignition switch (and engine stop switch) “ON”,
power is delivered to the hot light via the Red/White
wire. The Blue/White wire (ground) out of the light
socket is connected to the PDM. If engine coolant
reaches the specified temperature, the thermistor
sends a signal to the PDM, which completes the
ground path for the light. An open thermistor will
cause the engine hot indicator to light and cause the
fan motor to come on.
HOT LIGHT CIRCUIT TEST
1.
Disconnect the thermistor.
2.
Turn key and auxiliary switch to “ON” position.
The hot lamp (and fan) should come on. Check
the bulb and related wiring if the lamp does not
illuminate. Check PDM for proper operation.
FAN OPERATION / TESTING
Power to the fan is supplied via the PDM when the
ignition key and auxiliary shut--off switch are ON.
When
the
thermistor
reaches
the
specified
resistance, the signal is read by the PDM, which turns
on power to Orange/Blk wire. The ground path for the
fan motor is through the Brown wire in the harness.
CAUTION: Keep hands away from fan blades during
this procedure. Serious personal injury could result.
NOTE: The fan switch may not function or operation
may be delayed if oil level is low or if air is trapped in the
system. Be sure system is full and purged of air. Refer
to Maintenance Chapter 2.
FAN BYPASS TEST
1.
Disconnect the harness from the thermistor.
2.
Turn ignition key (and engine stop switch) “ON”.
The fan (and hot indicator) should turn on.
3.
If the fan does not run or runs slowly check the fan
motor wiring, ground, motor condition (refer to
Fan Motor Testing this section) and PDM. Repair
or replace as necessary.
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Summary of Contents for 2009 Trail Blazer 330
Page 94: ...ENGINE 3 48 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 110: ...FUEL SYSTEM CARBURETION 4 16 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 124: ...BODY STEERING SUSPENSION 5 14 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 196: ...ELECTRICAL 10 4 REVERSE LIMIT SYSTEM P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 226: ...ELECTRICAL 10 34 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 227: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BOSS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 228: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BOSS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 229: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BLAZER P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 230: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BLAZER P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...