Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1420: Device VoltageDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Power Sliding Door Module B+ | B1292, B1395 | B1292, B1395 | -- | -- |
Left/Right Sliding Door Open/Close Switch Signal | 2 | 2 | 2 | -- |
Left/Right Door Enable Switch Signal | 1, 2 | -- | 2 | -- |
Left/Right Sliding Door Latch Motor Control | 1 | 1 | 1 | -- |
Park/Neutral Position Park Signal | -- | 1 | -- | -- |
Left/Right Sliding Door Clutch Control | B1292, B1293, B1294 | B1292, B1293, B1294 | B1293 | -- |
Left/Right Sliding Door Motor Open Control | B1292 | B1292 | B1292 | -- |
Left/Right Sliding Door Motor Close Control | B1292 | B1292 | B1292 | -- |
Left/Right Sliding Door Detent Switch Signal | 1 | B1294 | 1 | -- |
Left/Right Sliding Door Sensor Voltage Reference | 1 | B1395 | 1 | -- |
Left/Right Sliding Door Sensor Low Reference | 1 | B1395 | 1 | -- |
Left/Right Sliding Door Sensor 1 Signal | 1 | B1395 | 1 | -- |
Left/Right Sliding Door Sensor 2 Signal | 1 | B1395 | 1 | -- |
Left/Right Sliding Door Clutch Ground | -- | B1292, B1293, B1294 | 1 | -- |
PSDM Ground | -- | 1 | 1 | -- |
1. Power Sliding Door Malfunction 2. Power Sliding Door Open/Close Switch Inoperative | ||||
Circuit/System Description
The body control module (BCM) and the left and right power sliding door modules (PSDM) monitor the battery voltage through the B+ circuit. Damage to components and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
Battery voltage must be less than 9 volts or greater than 15.9 volts.
Conditions for Setting the DTC
While attempting the power sliding door OPEN or CLOSE command, the PSDM detects the power sliding door (PSD) system voltage is below 9 volts or above 15.9 volts for greater than 5 seconds.
Action Taken When the DTC Sets
The power sliding door(s) will be inoperative
Conditions for Clearing the DTC
| • | The DTC will be current for as long as the fault is present. |
| • | When the fault is no longer present, the DTC will be a history DTC. |
| • | A history DTC will clear after 50 ignition cycles. |
Diagnostic Aids
DTC B1292, B1293, B1294, B1395, B1420, B3250, B3260 or any combination of these DTCs may be set due to an overcinch condition in which the sliding door motor may continue to run for up to 3 seconds after the door is fully closed. Reference any power sliding door overcinching bulletins first before performing any extensive power sliding door diagnostics.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Sliding Door (PSD) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Battery Voltage Signal parameter while commanding the power sliding door to OPEN and CLOSE by using the power sliding door switch. The parameter should be between 9.6-13.6 volts.
Circuit/System Testing
- Ignition OFF, disconnect the X1 harness connector at the appropriate PSDM.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 14 and ground.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for PSDM replacement, programming, and setup.
