Diagnostic Aids

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

The S38 On/Off Vehicle switch is a mechanical switch and a sticking or binding condition may cause a plausibility DTC.
The S38 On/Off Vehicle Switch Voltage when the switch is not pressed is between 3.34 and 4.26 V.
The S38 On/Off Vehicle Switch Voltage when the switch is pressed is between 1.43 and 2.97 V.
If the voltage detected on the S38 On/Off Vehicle switch is less than 1.42 V for more than 2 seconds a short to ground DTC will set.
If the voltage detected on the S38 On/Off Vehicle switch is greater than 4.26 V for more than 2 seconds an open/short to voltage DTC will set.

NOTE:

The circuit numbers listed below are a general overview and may not reflect the schematics for this document.

The last 2 digits of the circuit number are significant in identifying its power and/or ground function.
- Circuits ending in 42 are primary fused B+ circuits (generally the first fuse in the circuit after the battery)
- Circuits ending in 40 are secondary fused circuits (generally fuses in a fuse block after the primary circuit)
- Circuits ending in 39 and 41 are ignition voltage circuits.
- Circuits ending in 50 are grounds.
- Circuits ending in 51 are low reference (ground).