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
READ NEXT:
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
SEE MORE:
Fan Controls
Component Location Index
RADIATOR FAN RELAY
A/C CONDENSER FAN RELAY
FAN CONTROL RELAY
A/C CONDENSER FAN ASSEMBLY
RADIATOR FAN ASSEMBLY
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 1
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
Symptom Troubleshooting Index
Circuit Diagram
Radiato
Heater Unit/Core
Replacement
SRS components are located in this area. Review the
SRS component locations, and the
precautions and procedures before
doing repairs or service.
1. Make sure you have anti-theft codes for the audio
system and the navigation system (if equipped).
2. Make sure the ignition is OFF, then disconnect the
