Toyota RAV4 Service Manual: Horn relay
On-vehicle inspection
- Remove engine room no. 1 Relay block cover
- Inspect integration relay (unit a: horn relay)
- Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room junction block.
Hint:
Tape the screwdriver tip before use.
- Measure the resistance of the integration relay.
Standard voltage 
If the result is not as specified, replace the integration relay.
- Install engine room no. 1 Relay block cover
Horn system
Parts location
System diagram
Problem symptoms table
Hint:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms are
listed in ...
Low pitched horn
Components
Removal
Remove radiator support opening cover
(see page et-4)
Remove front fender liner lh (see page et-4)
Remove front fender liner rh (see page et-4)
Remove front bumper ...
Other materials:
Check for open circuit
For an open circuit in the wire harness in fig. 1,
Check the resistance or voltage, as described below.
Check the resistance.
Disconnect connectors a and c, and measure
the resistance between them.
Standard resistance (fig. 2)
Hint:
Measure the resistance while lightly s ...
Inspection
Inspect cylinder head for warpage
Using a precision straightedge and feeler gauge,
measure the warpage of the contact surfaces of the
cylinder block and manifolds.
Maximum warpage:
0.08 Mm (0.0032 In.)
If the warpage is greater than the maximum, replace
the cylinder head sub-a ...
Rear axle hub and bearing
Components
On-vehicle inspection
Remove rear wheel
Disconnect rear drive shaft assembly lh
(for 4wd)
Disconnect the drive shaft (see page ds-69).
Remove rear disc brake cylinder assembly
lh (see page br-55)
Remove rear disc (see page br-57)
Check bearing backlash a ...
