Without Scan Tool

READING CODES






The SDD diagnostic system may be actuated by grounding the Diagnostic Enable circuit at pin C of the ALDL connector or by grounding pin D2 to D16 of the control module connector. After pin C is grounded, the lamp will be on for 7.5 seconds before beginning the blink code diagnostic sequence. This is followed by displaying code 12, three times to mark the beginning of the sequence. Then each stored error code is blinked out, in ascending order. Each code is displayed three times before proceeding to the next code. When all codes have been read, the entire code sequence will repeat, starting by blinking code 12, three times. The sequence will repeat until the Diagnostic Enable circuit is disconnected.
Codes are read by counting the number of flashes of the L.E.D. on the SDD control module. A code 12 would be indicated by the lamp flashing once, followed by a one second pause, followed by two flashes with a half second pause between flashes. There is a three second pause between codes.
If the diagnostic mode is entered, and no codes are stored in memory, the control module will continually display code 12.

ERROR CODES
The Speed Dependent Damping system has the ability to display the following diagnostic codes:
Code 12 Initiation Code
Code 13 Left Front Actuator Over Current
Code 14 Right Front Actuator Over Current
Code 15 Left Rear Actuator Over Current
Code 16 Right Rear Actuator Over Current
Code 23 Left Front Actuator Error
Code 24 Right Front Actuator Error
Code 25 Left Rear Actuator Error
Code 26 Right Rear Actuator Error
Code 31 Lift / Dive Input Error

CLEARING CODES
The error codes can be cleared by grounding the diagnostic enable circuit, pin C to pin A of the ALDL connector or pin D2 to D16 of the control module connector) three times (for approximately one second duration each) within 30 seconds. The control module indicates codes clear by turning the error lamp off for one second. The codes are not cleared when the battery or control module connectors are disconnected.
A code 31 (Lift / Dive Error) requires a cycle of the ignition switch to retest. For vehicles with 1992 control modules, after clearing error codes, the ignition cycle counter is disabled until the control module completes a successful self-test.

CONTINUOUS STRUT CYCLING
Grounding the Diagnostic Enable circuit through a 6.6k ~ 1k ohm resistor causes the system to enter a continuous cycling mode. The module will continuously cycle the actuators from comfort to Firm to normal, at the rate of one change every 2 seconds, and check for errors. If a fault exists with a strut, that strut will not cycle until a retest is performed. If the fault has cleared prior to the 3 minute retest, the strut will cycle when the retest is complete.

STRUT CONNECTORS






Strut connectors are attached to the top of the strut tenon with locking tabs. To remove the connector, squeeze the tabs and lift the connector vertically.
In order to maintain the sealing integrity of the connector, strut connectors should be disconnected from the strut only when necessary. When strut connectors are removed for service or diagnosis, before reconnecting, be certain that:
^ The connector cavity in the strut is clean and dry.
^ Connector seals are in the proper position.

NOTES ON INTERMITTENTS
Since many intermittent conditions are caused at electrical connections, diagnosis of intermittent conditions should include a visual and physical inspection of the connectors involved in the circuit. These connectors should be examined before replacing any components of the system. Some causes of connector problems are:
1. Corrosion, moisture or other foreign matter in the strut cavity or on the terminal mating surfaces which could insulate the terminals.
2. Incomplete mating of the connector halves.
3. Damaged terminals or connector bodies.