Computer/Integrating System Diagnosis
DTC B1420
CIRCUIT DESCRIPTION
Battery positive voltage is supplied at all times to the seat adjuster switch and the memory seat module (MSM)/driver position module (DPM) through the same circuit. The MSM/DPM uses this battery voltage input to determine if battery positive voltage is applied to the seat adjuster switch.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1420 Device Voltage
CONDITIONS FOR RUNNING THE DTC
The MSM/DPM must be powered and cannot have B1327 Battery Voltage Low as an active DTC for this DTC to set.
CONDITIONS FOR SETTING THE DTC
This DTC will set only when the MSM/DPM detects less than 3 volts from the circuit.
ACTION TAKEN WHEN THE DTC SETS
- Current and history codes are set.
- The MSM/DPM ignores all memory recall commands.
- All manual seat functions will operate.
CONDITIONS FOR CLEARING THE DTC
- The DTC will clear when the MSM/DPM detects that the voltage from the circuit is greater than 3 volts.
- The MSM/DPM will clear the history DTC after 50 fault-free ignition cycles.
DIAGNOSTIC AIDS
The MSM is also known as the DPM for this vehicle.
TEST
