I press the auto and off button and the # 88 blink

Hi angela324,

Here are the description and diagnostic procedures.

DTC INDICATOR LIGHT L: AN OPEN OR SHORT IN THE MODE CONTROL MOTOR CIRCUIT
1. Disconnect the mode control motor 10P connector.

2. Disconnect climate control unit connectors A (12P) and B (20P).

3. Check for continuity between body ground and climate control unit connector A (12P) terminals No. 1 and 6 individually, and between body ground and climate control unit connector B (20P) terminals No. 15, 17, 18, 19 and 20 individually.

Is there continuity?

YES
-Repair any short to body ground in the wire (s) between the climate control unit and the mode control motor.
NO
-Go to step 4.

4. Turn the ignition switch ON (II), and check the same terminals for voltage.

Is there any voltage?

YES
-Repair short to power in the wire between the climate control unit and the mode control motor. This short also damages the climate control unit. Repair the short to powder before replacing the climate control unit.
NO
-Go to step 5.

5. Turn the ignition switch OFF, and check for continuity between following terminals of climate control unit connectors A (12P) and B (20P) and the mode control motor 10P connector.

Is there continuity?
YES
-Check for loose wires or poor connections at climate control unit connectors A (12P) and B (20P) and at the mode control motor 10P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.
NO
-Repair any open in the wire(s) between the climate control unit and the mode control motor.