This PACCAR dash dimmer diagnostic codes manual covers electrical system troubleshooting for dash dimmer input and output circuits on PACCAR trucks manufactured 2011 and newer. Published by PACCAR as part of their Electrical System Service Manual (publication PM819003/KM815056), this document provides step-by-step procedures for technicians using the Electronic Service Analyst (ESA) diagnostic tool to isolate dimmer control faults.
The manual addresses four primary diagnostic trouble codes: DTC 148703 (dash dimmer input open), DTC 148704 (dash dimmer input short), DTC 149106 (dimmer output circuit 1 short), and DTC 149206 (dimmer output circuit 2 short). Each code corresponds to specific circuit failures between the CECU (Cab Electronic Control Unit) connectors and the driver-controlled dimmer rheostat.
Document details
| Brand | PACCAR |
| Model coverage | 2011 and newer PACCAR trucks |
| System/Group | DTCs / Cab |
| Publication number | PM819003/KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Electrical System Service Manual — Chapter 12
- Dash Dimmer Input Open or Shorted, Dash Dimmer Output Shorted
- DTC 148703, DTC 148704, DTC 149106 and DTC 149206
- Symptom: dash dimmer inoperative
- Diagnostic procedure using Electronic Service Analyst (ESA)
- Step-by-step troubleshooting flow chart with pin-level testing
- CECU connector pin assignments (52 Pin connector C, 9 Pin connector A)
- Dimmer rheostat resistance specifications (390–1390 ohms)
- Wiring continuity and component replacement guidance
Applies to
This PACCAR dash dimmer diagnostic codes document applies to all PACCAR trucks with model year 2011 and newer equipped with multiplexed instrumentation systems and CECU electronic control units. The procedures reference the 52 Pin CECU connector C and 9 Pin CECU connector A used across PACCAR’s heavy-duty truck platform during this generation. For official PACCAR documentation and additional service resources, visit PACCAR official website.
Who needs this PACCAR dash dimmer diagnostic codes manual
Certified diesel mechanics, shop electrical technicians, and workshop owners working on PACCAR trucks 2011 and newer need this PACCAR dash dimmer diagnostic codes resource. The manual is essential for anyone performing dash dimmer troubleshooting or component replacement using ESA diagnostic hardware.
The full PACCAR dash dimmer diagnostic codes PDF is available in the DiagTechPro manuals library. A free account is required to download this document and access thousands of other truck service manuals and diagnostic guides.
