Possible Causes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Wiring, terminals or connectors
- Mode select switch
- HVAC module concern
- ABS module concern
CAUTION:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
- OC1: CHECK FOR ABS MOUDLE DTCS
- Put the ABS module in sleep mode by performing the following steps:
- With ALL doors closed, set the ignition from ON to OFF.
- Disconnect the diagnostic scan tool.
- Open the door, exit the vehicle and close the door.
- Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
- Ignition ON, engine OFF.
Carry out the ABS self-test.
- Are there any DTCs currently active and present in the ABS module?
Yes No DIAGNOSE all ABS module DTCs before diagnosing the snow/sand mode feature. GO to the ABS module DTC Chart in this article. Go to OC2.
- Put the ABS module in sleep mode by performing the following steps:
- OC2: CHECK FOR HVAC MOUDLE DTCS
Carry out the HVAC self-test.
- Are there any DTCs currently active and present in the HVAC module?
Yes No DIAGNOSE all HVAC module DTCs before diagnosing the snow/sand mode feature. REFER to the Climate Control System General Information article to diagnose the HVAC module. Go to OC3.
- Are there any DTCs currently active and present in the HVAC module?
- OC3: CHECK THE SNOW/SAND MODE CIRCUIT FOR AN OPEN
- Ignition OFF.
- Mode Select Switch connector disconnected.
- HVAC_A Module connector disconnected.
- Measure the resistance between:
(+) Mode Select Switch Connector, Harness Side (-) HVAC_A Module Connector, Harness Side SND_MD SND_MD - Is the resistance less than 3 ohms?
Yes No Go to OC4. REPAIR the circuit.
- OC4: CHECK THE SNOW/SAND MODE CIRCUIT FOR A SHORT TO GROUND
- OC5: CHECK THE MODE SELECT SWITCH GROUND CIRCUIT FOR AN OPEN