What Does B1598 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the driver's seat seatback autoglide rearward switch circuit. The autoglide feature automatically moves the seatback rearward when activated, typically for easier entry/exit. The BCM detected voltage below the expected threshold on the switch signal circuit, indicating an abnormal electrical path to ground.
Common Causes
40%
Damaged or chafed wiring harness under the seat causing short to ground on switch signal wire
30%
Faulty seatback autoglide rearward switch with internal short to ground
20%
Corroded or moisture-damaged connector at seat switch or BCM causing ground fault
10%
Failed seat control module or BCM internal circuitry with shorted input channel
Diagnostic Steps
1
Step 1: Visually inspect all wiring harness routing under the driver's seat, particularly where harness contacts seat rails or mounting brackets. Look for chafed insulation, crushed wires, or damage from seat movement. Check all connectors for corrosion, bent pins, or moisture intrusion.
2
Step 2: Disconnect the seatback autoglide rearward switch connector. Using a digital multimeter, measure resistance between the switch signal wire (at harness side) and vehicle ground. Should read infinite resistance (open circuit). If continuity exists, trace and repair the short in the harness between switch and BCM.
3
Step 3: With switch still disconnected, measure resistance across the switch terminals. Compare to manufacturer specifications (typically open when not pressed, closed/low resistance when activated). If switch shows continuity to ground terminal when unpressed, replace the switch.
4
Step 4: If wiring and switch test normal, inspect connectors at the seat control module and BCM for terminal corrosion or pushed-back pins. Clean connectors with electrical contact cleaner and ensure proper terminal seating.
5
Step 5: Reconnect all components, clear the code, and cycle the autoglide function through full operation. Monitor live data for switch state while manually activating the switch to confirm proper signal voltage (typically 5V or 12V when open, 0V when pressed).
6
Step 6: Perform seat movement test in all directions while monitoring for code recurrence. Move seat to various positions to verify harness flex does not recreate the short condition.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the driver's seat seatback autoglide rearward switch circuit. The autoglide feature automatically moves the seatback rearward when activated, typically for easier entry/exit. The BCM detected voltage below ...
The most common cause of B1598 (Driver's Seat Seatback Autoglide Rearward Switch Circuit Short to Ground) is: Damaged or chafed wiring harness under the seat causing short to ground on switch signal wire
Typical repair costs for B1598 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This code affects only the convenience feature of automatic seatback positioning and does not impact vehicle operation or safety systems. Repair at convenience, though loss of this function may make entry/exit more difficult for some drivers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1598 to identify the root cause.
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Quick Info
Category
Body
System
Body Comfort and Convenience Systems
Difficulty
Type
Manufacturer
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