AutoCodes – Lexus – C1782 Lexus

C1782 Lexus Code - Stop Light Switch Circuit

Quick Answer

When the brake pedal is depressed, the stop light switch comes on and battery positive voltage is applied to a terminal of the Suspension Control ECU. Common causes include Faulty Stop Light Switch, Stop Light Switch harness is open or shorted, Stop Light Switch 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: C1782 Lexus indicates Stop Light Switch Circuit.
Common causes: Common causes include Faulty Stop Light Switch, Stop Light Switch harness is open or shorted, Stop Light Switch 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 3,698

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 Nov 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1782 Lexus Description

When the brake pedal is depressed, the stop light switch comes on and battery positive voltage is applied to a terminal of the Suspension Control ECU. This signal is used by the Suspension Control ECU as one of the starting conditions for anti-dive control.

OBDII Code C1782 Lexus - Stop Light Switch Circuit - AutoCodes.com — C1782 Lexus Code - Stop Light Switch Circuit

What does this mean?

What are the Possible Causes of the DTC C1782 Lexus?

Faulty Stop Light Switch
Stop Light Switch harness is open or shorted
Stop Light Switch circuit poor electrical connection
Faulty Suspension Control ECU

How to Fix the DTC C1782 Lexus?

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 C1782 Lexus 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 C1782 Lexus Code

1. What are the common symptoms of OBDII code C1782 in a Lexus related to the Stop Light Switch Circuit?

- Common symptoms include the brake lights staying on constantly, brake lights not working at all, and the inability to shift out of park.

2. What are the possible causes of the C1782 code in a Lexus?

- The code can be triggered by a faulty stop light switch, wiring issues, a blown fuse, or a malfunctioning brake light circuit.

3. How can I diagnose the cause of the C1782 code in my Lexus?

- Start by checking the stop light switch for proper functionality, inspecting the wiring for any damage, testing the brake light bulbs, and ensuring the fuse related to the brake lights is not blown.

4. Can a malfunctioning brake light switch cause other problems in my Lexus besides triggering the C1782 code?

- Yes, a faulty stop light switch can also lead to issues with the cruise control system and affect the operation of the vehicle's transmission.

5. How can I repair the C1782 code related to the Stop Light Switch Circuit in my Lexus?

- To repair the issue, you may need to replace the stop light switch if it is found to be faulty, repair any damaged wiring, replace blown fuses, or address any other underlying issues causing the code.

6. Is it safe to continue driving my Lexus with the C1782 code triggered?

- It is not recommended to drive your vehicle with the C1782 code active, as it can affect the proper operation of your brake lights, potentially compromising safety on the road.

7. Will resetting the OBDII code clear the issue with the Stop Light Switch Circuit in my Lexus?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the C1782 code to trigger.

8. Can I replace the stop light switch in my Lexus myself, or should I seek professional help?

- If you have experience working on automotive electrical systems, you may be able to replace the stop light switch yourself. Otherwise, it's advisable to consult a professional mechanic.

9. Are there any preventive measures I can take to avoid the C1782 code in my Lexus?

- Regularly inspecting the brake lights, checking the functionality of the stop light switch, and addressing any issues promptly can help prevent the C1782 code from occurring.

10. How long does it typically take to repair the C1782 code related to the Stop Light Switch Circuit in a Lexus?

- The repair time can vary depending on the exact cause of the issue. It may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.