This procedure covers the removal and replacement of the negative battery cable on a 2018-2024 Honda Accord with the 1.5L turbocharged engine, including all ground connections.

Warnings

Tools required

Parts

• Negative battery cable assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and apply parking brake
2. Turn off all electrical accessories and remove key from ignition
3. Open hood and locate battery in engine compartment on driver's side
4. Allow engine to cool if recently driven
5. Take note of radio code if applicable (found in owner's manual or glovebox)

Procedure

1. 1

   Remove negative battery terminal
   Locate the negative battery terminal (marked with a minus sign or BLACK color). Using a 10mm socket, loosen the terminal bolt by turning counterclockwise. Do not remove the bolt completely, just loosen it enough to slide the cable off. Wiggle the terminal gently while pulling upward to remove from battery post. Move the cable away from the battery and secure it so it cannot accidentally contact the terminal.
2. 2

   Locate primary chassis ground point
   The primary chassis ground is located on the driver's side of the engine bay, typically bolted to the body near the strut tower or inner fender. Trace the negative cable from the battery to identify all ground connection points. On the 1.5T engine, there are typically 2-3 ground points including chassis ground and engine block ground.
3. 3

   Remove chassis ground connection
   Using a 12mm socket with extension, remove the bolt securing the ground cable to the chassis ground point. Note the exact position and any washers or spacers present. The ground cable may have multiple terminals stacked at this location.
4. 4

   Remove engine block ground connection
   Locate the engine ground strap connection on the engine block (typically on the transmission bell housing area or cylinder head). Using a 12mm socket, remove the bolt securing the ground strap. Keep track of any washers and the orientation of the strap terminal.
5. 5

   Remove additional ground straps if present
   Check for any additional ground straps between the engine and body. On some configurations, there may be a ground strap near the battery tray or firewall. Remove these connections using appropriate sockets, noting their exact positions for reassembly.
6. 6

   Remove negative cable from vehicle
   Once all ground connections are disconnected, carefully extract the negative battery cable from the engine bay. Note the routing path through any clips or retainers for proper reinstallation. Take photos if helpful for reference during installation.
7. 7

   Clean all connection points
   Using a wire brush, thoroughly clean the battery post, cable terminals, and all ground contact surfaces on the chassis and engine. Remove all corrosion, dirt, and oxidation. Clean contact surfaces are critical for proper electrical conductivity. Wipe clean with shop towels.
8. 8

   Install new negative cable to ground points
   Route the new negative cable following the same path as the original. Begin by connecting the ground terminals to the chassis and engine block ground points. Ensure all terminals are properly seated against clean metal surfaces with any original washers or spacers in their correct positions.
9. 9

   Torque chassis ground bolt
   Install and torque the chassis ground bolt to specification. Ensure the terminal has full contact with the mounting surface and is not binding on any surrounding components. Verify the connection is tight and secure.
   Torque spec

   Ground Cable Bolt13 Nm (10 lb-ft)
10. 10

    Torque engine block ground connections
    Install and torque the engine block ground strap bolts to specification. Ensure the strap is not twisted and has clean metal-to-metal contact at both mounting points. These connections are critical for engine electrical system operation.
    Torque spec

    Ground Strap Bolts12 Nm (9 lb-ft)
11. 11

    Secure cable routing
    Ensure the negative battery cable is properly routed through all original clips and retainers. The cable should not contact any sharp edges, hot surfaces, or moving components. Verify adequate clearance from the serpentine belt and pulleys.
12. 12

    Connect negative terminal to battery
    Place the negative terminal onto the battery post, ensuring it seats fully. The terminal should slide down onto the post with slight resistance. Install the terminal bolt and tighten to specification using a torque wrench. Do not overtighten as this can damage the terminal or battery post.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Apply a thin coat of dielectric grease to the battery terminal connection to prevent corrosion
2. Verify all ground connections are tight and terminals are making full contact with mounting surfaces
3. Ensure cable routing matches original configuration and is secured in all clips

Verification

• Turn ignition to ON position (engine off) and verify dash lights illuminate normally
• Start the engine and confirm it cranks and starts normally without hesitation
• Check that all electrical systems function properly (lights, radio, power windows, etc.)
• Reset power window auto-up/down function if necessary by fully lowering then raising each window and holding the switch for 2 seconds
• Re-enter radio code if applicable
• Verify no warning lights remain illuminated on the dashboard after initial bulb check
• Inspect all ground connection points for tightness and proper contact

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