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Honda Ridgeline. Manual - part 453

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−

DTC B1000:

YES

Control Unit

Connector

YES

Control Unit

Appropriate Connector

22-108

Multiplex Integrated Control System

DTC Troubleshooting

Communication Bus Line Error

(BUS-OFF)

1. Clear the DTCs with the HDS.

2. Turn the ignition switch OFF, and then back ON (II).

3. Wait for 6 seconds or more.

4. Check for DTCs with the HDS.

Go to step 5.

Intermittent failure. The communication bus

line is OK at this time. Check for loose or poor
connections, or worn/shorted wires. If the
connections are good, check the battery condition
(see page 22-74) and the charging system.

5. Check for DTCs with the HDS.

Go to step 6.

Faulty MICU; replace the under-dash fuse/

relay box.

6. Turn the ignition switch OFF.

7. Disconnect the appropriate connector at each

control unit in the table one at a time. Clear the DTC,
then recheck for DTCs after each unit is
disconnected.

Gauge Control
Module

Connector B (14P)

Relay Control
Module

Connector J (10P)

Door Multiplex
Control Unit

Power window master
switch connector (23P)

Combination Switch
Control Unit

Connector (12P)

HVAC Control Unit/
Climate Control Unit

Connector (30P)

Go to step 8.

Check the power and grounds to the control

unit that was disconnected when B1000 did not
reset. If OK, replace the control unit.

8. Disconnect all of the appropriate connectors for

each of the units in the table.

Gauge Control
Module

Connector B (14P)

Relay Control
Module

Connector J (10P)

Door Multiplex
Control Unit

Power window master
switch connector (23P)

Combination Switch
Control Unit

Connector (12P)

HVAC Control Unit/
Climate Control Unit

Connector (30P)

9. Disconnect under-dash fuse/relay box connectors

D (17P), J (21P), N (45P), X (39P), and P (30P).

Is DT C B1000 indicated?

Ar e DT Cs B1005, B1006, B1007 , B1008, B1010,
and B1011 also indicated?

Is DT C B1000 indicated with each individual unit
disconnected?

−

Connected Control

Unit

Under-dash fuse/

relay box terminal

YES

Connected Control

Unit

Under-dash fuse/

relay box terminal

YES

22-109

10. Check for continuity between each of the under-

dash fuse/relay box terminals listed in the table and
body ground.

Gauge Control Module

N28

Relay Control Module

D11

Door Multiplex Control
Unit

Combination Switch
Control Unit

X27

HVAC Control Unit/
Climate Control Unit

N22

Repair the short to ground in the wire

between the under-dash fuse/relay box and the
affected control unit.

Go to step 11.

11. Check for voltage between each of the under-dash

fuse/relay box terminals listed in the table and
body ground.

Gauge Control Module

N28

Relay Control Module

D11

Door Multiplex Control
Unit

Combination Switch
Control Unit

X27

HVAC Control Unit/
Climate Control Unit

N22

Replace the under-dash fuse/relay box.

Repair the short to power in the wire between

the under-dash fuse/relay box and the affected
control unit.

Is ther e continuity?

Is ther e less than 0.1 V ?

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−

DTC B1050:

DTC B1100:

DTC B1150:

DTC B1200:

DTC B1250:

YES

Under-dash fuse/

relay box

connector

B-CAN connected unit

connector

YES

22-110

Multiplex Integrated Control System

DTC Troubleshooting (cont’d)

Communication Bus Line Error

NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-99).

1. Clear the DTCs with the HDS.

2. Turn the ignition switch OFF, and then back ON (II).

3. Wait for 6 seconds or more.

4. Check for DTCs with the HDS.

Go to step 5.

Intermittent failure, the system is OK at this

time. Check for loose or poor connections at the
MICU and B-CAN connected units in the table.

5. Check for DTCs with the HDS.

Connector D (17P)
No. 11 terminal

Under-hood fuse/relay
box connector J (10P)
No. 8 terminal

Connector J (21P)
No. 4 terminal

Door multiplex control
unit 23P Connector
No. 16 terminal

Connector N (45P)
No. 28 terminal

Gauge control module
connector B (14P) No. 6
terminal

Connector N (45P)
No. 22 terminal

HVAC control unit 30P
connector No. 11
terminal or climate
control unit 30P
connector No. 30
terminal

Connector X (39P)
No. 27 terminal

Combination switch
control unit 12P
connector No. 3 terminal

Troubleshoot DTC B1000.

Intermittent failure, the system is OK at this

time. Check for loose or poor connections at the
MICU and B-CAN connected units in the table.

Ar e DT Cs B1050, B1100, B1150, B1200, and/ or
B1250 indicated?

Is DT C B1000 also indicated?

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DTC B1001:

DTC B1002:

DTC B1005:

YES

22-111

MICU Internal Error (CPU Error)

MICU Internal Error (EEPROM

Error)

MICU Lost Communication with

the Relay Control Module

NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-99).

1. Clear the DTCs with the HDS.

2. Turn the ignition switch OFF, and then back ON (II).

3. Operate the door lock (LOCK/UNLOCK).

4. Check for DTCs with the HDS.

Faulty MICU; replace the under-dash fuse/

relay box.

Intermittent failure, the MICU is OK at this

time. Check for loose or poor connections. If the
connections are good, check the battery condition
(see page 22-74) and the charging system.

NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-99).

1. Clear the DTCs with the HDS.

2. Turn the ignition switch OFF, and then back ON (II).

3. Wait for 6 seconds or more.

4. Check for DTCs with the HDS.

Go to step 5.

Intermittent failure, the relay control module

is OK at this time. Check for loose or poor
connection at the relay control module connector J
(10P), and at the under-dash fuse/relay box
connector D (17P). If the connections are good,
check the battery condition (see page 22-74) and
the charging system.

5. Check for DTCs with the HDS.

Go to Relay Control Module Input Test

(see page 22-125).

Check for an open in the communication

circuit between the MICU and the relay control
module. If the circuit is OK, the MICU is faulty;
replace the under-dash fuse/relay box. If the circuit
is bad, repair the open.

Ar e DT Cs B1001 and/ or B1002 indicated?

Is DT C B1005 indicated?

Is DT C B1158 also indicated?

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