Toyota Sienna Service Manual: Heater relay (for rear air conditioning system)
ON-VEHICLE INSPECTION
1. INSPECT REAR HEATER RELAY
(a) Remove the rear heater relay.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
If the resistance is not as specified, replace the rear heater relay.
Heater relay
ON-VEHICLE INSPECTION
1. INSPECT HEATER RELAY
(a) Remove the heater relay.
(b) Measure the resistance according to the value(s) in
the table below.
Standard resistance
If the resistance i ...
Air conditioning control assembly
COMPONENTS
...
Other materials:
Communication Error from VSC to ECM
DTC P1630 Communication Error from VSC to ECM
DTC U0122 Lost Communication with Vehicle Dynamics
Control Module
DESCRIPTION
The skid control ECU sends signals such as cruise control cancel demand
signals and brake operation
demand (from ECM) response signals to the ECM when the dynamic laser ...
Precaution
1. INITIALIZATION
NOTICE:
Perform RESET MEMORY (AT initialization) when
replacing the automatic transaxle assembly, engine
assembly or ECM (See page AX-16).
Perform REGISTRATION (VIN registration) when
replacing the ECM (See page ES-15).
HINT:
Initializatio ...
How to proceed with troubleshooting
HINT:
Use the following procedures to troubleshoot the tire
pressure warning system.
*: Use the intelligent tester.
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS
(a) Interview the customer to confirm the trouble.
HINT:
It is important to collect as much specific informat ...
