B120 - Twilight Delay & Panel Dimming

Since both potentiometers use the same power and ground, chances are that the problem is in the power or ground circuits when both codes are stored.
1. BCM data value BD43 displays a twilight delay value. The normal range is between 6 and 94%.
2. Check to see if the open or grounded circuit reading is due to the circuit or the switch assembly. If voltage can be read across CKTs. 705 & 736 after disconnecting the switch assembly, the BCM and wiring are OK.
3. Check for 5 volt reference at the switch. If 5 volts is present. CKT 736 is open. If CKT 736 is open, the open will be between term. A3 on left switch assembly and cavity 63 on dash-IP transition connector.
4. If CKT 705 is suspected of being grounded, remove the HVAC programmer and BCM connectors prior to making a ground check.
5. If there is no ground in CKT 705 replace HVAC programmer or BCM.

Note on Intermittents
If an intermittent codes B120 & B122 are being set, manipulate the related wiring while observing either BCM data VALUE BD42 and/or BD43. If the failure is induced, the reading will jump from its normal value to a reading outside of its range, (see specific charts for range).