Campaign - Multiplex Integrated Control Unit Replacement: Overview
03-041July 31, 2003
Applies To:
2003 Accord L4 2-Door - From VIN 1HGCM7...3A000001 thru 1HGCM7...3A016733
Product Update: Accord L4 Multiplex Integrated Control Unit
BACKGROUND
When you insert the key in the driver's door lock and turn it quickly, the passenger's door may not lock and the security system may not arm. In addition, if the trunk is opened and then immediately closed, the security system may not arm the trunk. This is an intermittent problem that does not affect the remote transmitters. It is caused by a timing discrepancy in the multiplex integrated control unit (MICU).
CUSTOMER NOTIFICATION
All owners of affected vehicles will be sent a notification of this product update. The customer notification may also contain information on other product updates. An example of the customer notification for this MICU product update is shown in this service bulletin.
Not all vehicles within the VIN range are affected by this product update. Before beginning work on a vehicle, verify its eligibility by checking at least one of these items:
^ The customer has a notification letter.
^ The vehicle is shown on your campaign responsibility report.
^ The vehicle is shown as eligible on an iN VIN status inquiry.
If any affected vehicles are in your new or used vehicle inventory, repair them as described in this service bulletin.
CORRECTIVE ACTION
Replace the under-dash fuse/relay box. (The MICU is inside the fuse/relay box.)
PARTS INFORMATION
Under-Dash Fuse/Relay Box (EX models):
P/N 38200-SDN-A22, H/C 7426554
Under-Dash Fuse/Relay Box (LX models):
P/N 38200-SDN-A02, H/C 7426539
WARRANTY CLAIM INFORMATION
Operation Number: 747103
Flat Rate Time: 0.6 hour
Failed Part: P/N 38200-SDN-A21
H/C 7170665
Defect Code: 5AY
Contention Code: L98
Skill Level: Repair Technician
REPAIR PROCEDURE
NOTE:
SRS components are located in this area. Review the SRS component locations, precautions, and procedures before doing this repair procedure (see page 23-17 of the 2003 Accord Service Manual).
1. Write down your customer's radio station presets. Make sure you have the anti-theft code for the radio and the navigation system (if equipped).
2. Disconnect the negative cable and the positive cable from the battery, then wait at least 3 minutes.
3. Remove the left door sill trim and the left kick panel (see page 20-90 of the 2003 Accord Service Manual).
4. Remove the two mounting bolts from the under-dash fuse/relay box, then pull the fuse box away from the body.
5. Disconnect the connectors, and remove the fuse box.
6. Carefully remove all fuses and relays from the old fuse box, and install them in their correct locations in the new fuse box.
7. Connect the connectors to the new fuse box, then install the fuse box with the original mounting bolts.
8. Reconnect the positive and negative battery cables.
9. Enter the anti-theft code for the radio and the navigation system (if equipped).
10. Enter your customer's radio station presets, and set the clock.
11. Make sure all electrical components are working.
12. Install the left kick panel and the left door sill trim.
13. Center-punch a completion mark above the fifth character of the engine compartment VIN.
Disclaimer