Software Information:
AIR CONDITIONING:1990 MY Sedan Range vehicles incorporate one of three different specification A/C systems. The JDS test procedure is slightly different for each system.
Vehicles Built Before VIN 605856-
^ If a motorized aspirator assembly is not installed, a JDS test can be performed by following the on-screen instructions.
^ If the motorized aspirator kit has been installed, the JDS test should be performed as it would if the kit was not installed. Answer "No" when JDS asks if a motorized aspirator is installed. The test will cover the entire A/C system except the aspirator motor.
To test the aspirator motor, use a digital volt ohm meter or JDS in multimeter mode. Battery voltage is supplied via connector AC4 and should be present when the ignition is switched on. The second wire provides a constant ground via connector AC4.
Vehicles Built After 605855-
^ JDS starts an A/C system test by testing the aspirator motor. JDS requests that the ignition be switched to "auxiliary", which is incorrect. The switch should be set to the "ignition on" position.
NOTE: JDS is not capable of testing A/C system calibration problems that may result in temperature drift, temperature variation between outlet vents temperatures too hot/cold for demand setting. JDS should only be used for a functional failure after the vacuum, refrigerant and heater/cooling systems are known to be operating properly.
Due to a software error, when JDS finds a short circuited compressor clutch or solar sensor, the following warning will appear on the screen: "System error 208 contact GenRad". If this warning appears, wiring diagrams must be used to locate the short circuit. This problem is software related and cannot be corrected by contacting GenRad.
CRUISE CONTROL:
During the cruise control test on 1990 MY Sedans, JDS may ask for connector LB 35 (linear gearbox switch) to be probed or disconnected, which is incorrect. The correct connector to probe or disconnect is LB 142. LB 142 is a green 15-way Pmhd connector located at the gear selector assembly.
TEVES ABS:
During the Teves ABS test, JDS will ask for the current probe to be placed around Brown/orange wire connected to connector RS 96. JDS describes RS 96 as a black relay base, which is incorrect. RS 96 is actually a yellow relay base.
During the ABS test, JDS will ask for the in-line fuses to be located (LS 127 and LS 129). The JDS location description is "Bottom LH "A" Post - Behind fusebox". The fuses are actually secured to to the left side harness, between the fusebox and the bulkhead.