What Does B2159 Mean?
B2159 indicates that the Body Control Module (BCM) has detected an electrical short to ground in the output circuit for Memory Seat Position #1. This affects the power memory seat system, specifically the driver's seat memory function. The BCM detected that the control circuit voltage dropped to ground level when commanding the memory seat module, indicating a wiring fault or component failure in the memory seat output circuit.
Common Causes
45%
Damaged or chafed wiring harness between BCM and memory seat module causing short to ground
30%
Failed memory seat control module with internal short circuit
15%
Corroded or water-damaged connector pins at BCM or seat module creating ground path
10%
Failed BCM with internal driver circuit damage
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring harnesses running under driver's seat and to BCM, checking for pinched, chafed, or damaged wires where harness contacts seat tracks or metal brackets. Look for evidence of wire insulation damage exposing copper conductor.
2
Step 2: Disconnect the memory seat control module connector and measure resistance between the memory #1 output circuit terminal (consult wiring diagram for specific pin) and vehicle ground using a digital multimeter. Reading should be greater than 10k ohms; low resistance (under 5 ohms) confirms short to ground in wiring.
3
Step 3: If wiring tests good, disconnect BCM connector and measure resistance from BCM side of memory #1 output pin to ground. Infinite resistance indicates BCM internal short; low resistance confirms wiring harness short between BCM and previously disconnected seat module.
4
Step 4: Inspect all connector terminals for corrosion, bent pins, or moisture intrusion using a flashlight and magnification. Clean connectors with electrical contact cleaner and dielectric grease if corrosion found.
5
Step 5: With fault isolated to specific component or harness section, repair or replace damaged wiring, connectors, or modules as needed. Clear codes and cycle memory seat function through all positions to verify proper operation and confirm no code returns.
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
B2159 indicates that the Body Control Module (BCM) has detected an electrical short to ground in the output circuit for Memory Seat Position #1. This affects the power memory seat system, specifically the driver's seat memory function. The BCM detected that the control circuit voltage dropped to gro...
The most common cause of B2159 (Memory #1 output Short to Ground) is: Damaged or chafed wiring harness between BCM and memory seat module causing short to ground
Typical repair costs for B2159 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects the memory seat convenience feature and does not impact vehicle safety systems. Repair at your convenience, though loss of memory seat function may affect driver comfort and optimal seating position for airbag effectiveness.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2159 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Power Memory Seat System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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