AutoCodes – GMC – B1785 GMC

B1785 GMC Code - Driver Seat Motor Recline Circuit

Quick Answer

The seat adjuster motors are controlled by the Driver Seat Module (DSM) through the adjuster motor control circuits. Common causes include Faulty Driver Seat Motor Recline, Driver Seat Motor Recline harness is open or shorted, Driver Seat Motor Recline circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1785 GMC indicates Driver Seat Motor Recline Circuit.
Common causes: Common causes include Faulty Driver Seat Motor Recline, Driver Seat Motor Recline harness is open or shorted, Driver Seat Motor Recline circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 794

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1785 GMC Description

The seat adjuster motors are controlled by the Driver Seat Module (DSM) through the adjuster motor control circuits. In an inactive state both of the motor control circuits are grounded within the DSM. In an active state the DSM switches the appropriate motor control circuit to battery positive voltage. The direction of the adjuster motor rotation is determined by which of the motor control circuits is switched to battery positive voltage while the other remains grounded. During adjuster motor operation the DSM also monitors the current flow through the motor control circuits.

OBDII Code B1785 GMC - Driver Seat Motor Recline Circuit - AutoCodes.com — B1785 GMC Code - Driver Seat Motor Recline Circuit

What does this mean?

What are the Possible Causes of the DTC B1785 GMC?

Faulty Driver Seat Motor Recline
Driver Seat Motor Recline harness is open or shorted
Driver Seat Motor Recline circuit poor electrical connection
Faulty Driver Seat Module (DSM)

How to Fix the DTC B1785 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1785 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1785 GMC Code

1. What are the common symptoms of OBDII code B1785 related to the Driver Seat Motor Recline Circuit in a GMC vehicle?

- Common symptoms include the inability to adjust the recline position of the driver's seat, the seat reclining on its own, or erratic movement of the seat back.

2. What are the possible causes of OBDII code B1785 in a GMC related to the Driver Seat Motor Recline Circuit?

- The code could be triggered by a faulty seat recline motor, damaged wiring or connectors in the circuit, a malfunctioning seat control switch, or a blown fuse.

3. How can I diagnose the issue causing OBDII code B1785 in my GMC's Driver Seat Motor Recline Circuit?

- You can use a multimeter to test the continuity of wiring, check the seat motor for proper function, and inspect the seat control switch for any signs of damage or wear.

4. Are there any simple troubleshooting steps I can take before seeking professional help for OBDII code B1785 in my GMC?

- Check the fuse related to the driver seat circuit, ensure the seat control switch is functioning correctly, and inspect the wiring and connectors for any visible damage or loose connections.

5. Can I continue driving my GMC with OBDII code B1785 related to the Driver Seat Motor Recline Circuit without fixing it?

- It is not recommended to drive with unresolved OBDII codes, as they can indicate underlying issues that may affect the overall safety and function of your vehicle.

6. How much does it typically cost to repair OBDII code B1785 related to the Driver Seat Motor Recline Circuit in a GMC?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor, excluding diagnostic fees.

7. Is it possible to reset OBDII code B1785 related to the Driver Seat Motor Recline Circuit in my GMC without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it is important to address the root cause of the problem to prevent it from reoccurring and potentially causing further damage.

8. Can a DIY enthusiast with basic automotive knowledge repair OBDII code B1785 related to the Driver Seat Motor Recline Circuit in a GMC?

- Depending on the exact cause of the issue, DIY repairs may be possible for those comfortable working with automotive electrical systems and wiring.

9. Are there any recalls or technical service bulletins related to OBDII code B1785 in GMC vehicles?

- It is recommended to check with your local GMC dealership or visit the manufacturer's website to see if there are any recalls or bulletins related to this specific OBDII code.

10. Will fixing OBDII code B1785 related to the Driver Seat Motor Recline Circuit in my GMC require reprogramming or calibration?

- Depending on the repair performed, recalibration or reprogramming may be necessary to ensure proper functionality of the driver seat motor and recline circuit.