QuestionQUESTION: The display/light on the control unit - that shows the "seat" and the direction of where the a/c or heat would be blowing from the vents continues to flash non stop when the vehicle is running. Can help me understand what the flashing seat/person light indicates ?
ANSWER: Hey Rich:
The flashin light indicates a fault in the system. Either a sensor or a tempature actuator is bad in the system. Here is how to find out what the code is that is making the head flash.
The CJ2 air conditioning is equipped with an on-board diagnostic feature which allows the heater-A/C control to detect certain system faults. The diagnostic feature may also be used to display certain data parameters. If the heater-A/C control detects a fault in the system, the man symbol will flash during the first 2 minutes of vehicle operation.
Entry into the diagnostic mode is gained by pressing in on both temperature knobs at the same time for 5 seconds. The following display modes are found within diagnostics:
• The diagnostic pointer
• The diagnostic value
By rotating the driver temperature knob one detent in either direction, the display is toggled between pointer and value. The value displayed is the decimal equivalent of the RAM contents. A 2 is formed using the minus sign and the leading 1 in order to display values over 199.
A diagnostic pointer mode is identified by a minus sign preceding the pointer number. The pointer provides an index, which identifies the corresponding diagnostic value. The diagnostic trouble codes (DTCs) reside under diagnostic pointer -00. The pointer will be set to this position upon initial entry into diagnostics. If more than one code exists, the codes will be displayed sequentially at a rate of 2 seconds per fault. Rotating the passenger temperature knob will switch the diagnostic pointers. A wrap around feature is provided if the pointer is continued past either end. Other data used by the computer resides under different diagnostic pointers, and may not be of use in observing the system. Press any mode button in order to exit the diagnostic mode.
Good luck :)
---------- FOLLOW-UP ----------
QUESTION: Todd, thanks for the follow-up.
I've been out of town, car's been sitting on the street. Turned it over and started smoking. Found radiator empty, so I know there's a leak or crack in something there also. Condenser and accumulator were changed last year - but not compressor, so Im guessing that's the missing piece for the A/C to work. The Ext temp gauge is always off - and I'm assuming the ambient outside temp sensor may need replacing too.. but that's a guess also...
But anyways, here's the pointers and the values.
Hopefully it makes sense. From what I read above, the only one that means anything about the problem is the -00. Which is 05. I'm sure that means something. If any other values look out of the norm, that'd be great to know also...
-00 05
-01 10
-02 129
-03 00
-04 00
-05 106
-06 176
-07 152
-08 02
-09 -149
-10 04
-11 00
-12 58
-13 00
-14 00
-15 13
-16 -106
-17 180
-18 43
-19 128
-20 -104
-21 00
-22 160
AnswerHi Rich:
Most of those #'s are jibberish but the 05 and 02 #'s are codes
the 05 is for a LH temp door actuator and the 02 is for an inside temp sensor. I would lean more towards the 05 codes more than anything else. The temp actautor motors go bad quite often on these cars.
xTooltipElement Attached is the trouble chart for the 05 dtc. It doesn't cut/paste right. it is actually a 5 column trouble chart so it's a bit jumbled. sorry.
If you if an issue with the temp actautor pull the fuse for the control head after the repair and before you turn the key back on. it should learn the new door motor after that. Good luck. Once again sorry for the confusion in the chart.
Good luck :)
Service Information
1998 Pontiac Grand Prix | Grand Prix (VIN W) Service Manual | HVAC | HVAC Systems - Automatic | Diagnostic Information and Procedures | Document ID: 591522
--------------------------------------------------------------------------------
DTC 05 LH air Door Motor Circuit Open or Shorted
Step
Action
Value(s)
Yes
No
1
•Disconnect the left electric actuator.
•Start the engine.
•Run the engine at idle until warm.
•Set the heater-A/C control to AUTO 16°C (60°F).
•Use a digital multimeter (DMM) in order to measure the voltage at the harness connector between terminal 10 (circuit 1688) and ground.
Is the measured voltage within the specified range?
4-6 V
Go to Step 2
Go to Step 3
2
Use the DMM in order to measure the voltage at the actuator harness connector terminal 5 (circuit 541).
Is the measured voltage within the specified range?
9-14 V
Go to Step 4
Go to Step 5
3
Locate and repair a poor connection or an open in circuit 1688 (LT BLU/BLK) between S245 and the left electric actuator harness connector terminal 10.
Is the repair complete?
--
System OK
--
4
Use a DMM in order to measure the voltage at the harness connector terminal 9 (circuit 733).
Is the measured voltage within the specified range?
4-6 V
Go to Step 6
Go to Step 7
5
Locate and repair a poor connection or an open between splice S206 and the left electric actuator harness connector terminal 5.
Is the repair complete?
--
System OK
--
6
Use a test lamp, connected to B+, in order to backprobe the left electric actuator harness connector terminal 7 (circuit 61).
Does the test lamp light?
--
Go to Step 9
Go to Step 8
7
Inspect circuit 733 (LT BLU) for a poor connection or an open .
Was a poor connection or an open found?
--
Go to Step 11
Go to Step 10
8
Locate and repair a poor connection or an open in circuit 61 (YEL) between S258 and the electric actuator harness connector terminal 7.
Is the repair complete?
--
System OK
--
9
Replace the left electric actuator. Refer to Temperature Actuator Replacement .
Is the repair complete?
--
System OK
--
10
Replace the heater-A/C control. Refer to Control Assembly Replacement .
Is the repair complete?
--
System OK
--
11
Locate and repair the fault in circuit 733 (LT BLU).
Is the repair complete?
--
System OK
--
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