Honda CR-V: Multiplex Integrated Control System
Component Location Index
- GAUGE CONTROL MODULE
- Input Test
- Replacement
- IMMOBILIZER-KEYLESS CONTROL UNIT (Built in receiver)
- MICU (Built into the under-dash fuse/relay box)
- Input Test
- Replacement
General Troubleshooting Information
Troubleshooting CAN Circuit Related Problems
NOTE: Check the PCM for DTCs, and troubleshoot PCM or F-CAN loss of communication errors first.
Using the HDS (Preferred method)
1. Go to B-CAN System Diagnosis Test Mode A to check for "Connected units" and DTCs.
2. If no DTCs are retrieved, go to B-CAN System Diagnosis Test Mode C or D.
Without HDS (Use only if the HDS is unavailable)
1. Check for communication circuit problems using B-CAN System Diagnostic Test Mode 1 and Mode 2.
2. Check for DTCs.
3. Sort, and then troubleshoot the DTCs in the order below.
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (beginning with the lowest number first; for example, if B1008 and B1011 are retrieved, troubleshoot B1008 first)
- Signal error DTCs
4. If no DTCs are retrieved, use B-CAN System Diagnostic Test Mode 2 to check all inputs related to failure.
How to display DTCs on the gauge control module
While in Test Mode 1, the DTCs which have been detected and stored individually by various B-CAN (Body-controller Area Network) units, will be shown one by one on the odometer display when the communication between the MICU and the gauge control module is normal. To scroll through the DTCs, press the select/reset button.
The unit that has stored the code can be identified by the number shown on the multi-information display.
How to clear the DTC
While in Test Mode 1, press and hold down the SELECT/RESET button for about 13 seconds.
Loss of Communication DTC cross-reference chart
When an ECU is unable to communicate with the other ECUs on the CAN circuit, the other control units will set loss of communication DTCs. Use this chart to find the control unit that is not communicating.
1. Find the transmitting control unit that is in the same row as all of the loss of communication DTCs retrieved.
2. Do the input test for the transmitting control unit.
BUS OFF and Internal Error Codes
DTC Troubleshooting Index
NOTE: Check the PCM for DTCs, and troubleshoot PCM or F-CAN loss of communication errors first, then record all DTCs. Sort them. by DTC type using the DTC troubleshooting index, then troubleshoot the DTC(s) in this order.
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (beginning with the lowest number first; for example, if B1008 and B1011 are retrieved, troubleshoot B1008 first).
- Signal error DTCs
MICU
Gauge Contro1 Module
Immobilizer-Keyless Control unit
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System Description
MICU Control Functions Index
The MICU (built into the under-dash fuse/relay box) is one of the B-CAN
components. The MICU controls many
systems related to the body controller area network, and also w
Troubleshooting
Troubleshooting - B-CAN System
Diagnosis Test Mode A
Check the PCM for DTCs, and troubleshoot PCM or F-CAN loss of communication errors
first, then do this diagnosis if the symptom is related to
the B
Sleep and Wake-up Mode Test
1. Shift to the sleep mode:
Turn the ignition switch OFF, and remove the key. If the MICU receives no
signals from the inputs listed below, it
will go into sleep mode in less than 40 seconds.
Drive
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System Description
Headlights System Description
The headlight system is composed of the MICU, the headlight and
dimmer/flash-to-pass switches (inside the
combination light switch), the left and right headlights, and the high beam
indicator.
The MICU controls the headlights with a built-in low beam headlight relay
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
NOTE:
Do not use this troubleshooting procedure if the A/C
compressor is inoperative. Refer to the symptom
troubleshooting index.
Before doing symptom troubleshooting, check for
powertrain DTCs.
1. Check the No.7 (20 A) fuse in the under-hood
fuse/relay box, and the No. 36 (10 A) fuse in the
